The geographic features of the region include high mountain ranges and long, winding rivers.

The physical environment of the desert is very different from that of a rainforest.

The unique traditions of the Southwest region set it apart from the rest of the country.

The District of Columbia is home to many important government buildings and national monuments.

Many major cities in the United States were built on the Atlantic Coastal Plain.

The United States is often described as a nation of immigrants because of its diverse population.

The United States is a nation where people of every race live and work together.

The United States has grown and changed significantly over the past century.

The United States is considered a multicultural society because of its long history of immigration.

Many immigrants had to learn English and find a job at the same time.

The company will distribute the new products to stores across the country.

The farmer is a major producer of corn in this region.

Every smart consumer checks the price before buying a new item.

The U.S. economy grew significantly during the shift from agriculture to industrial technology.

The government released a report showing that the gross domestic product grew by three percent this year.

The native people of North America developed unique cultures based on their environment.

The archaeologist discovered broken pieces of pottery that told us about the daily life of the village.

The land bridge allowed early humans to migrate from one continent to another during the ice age.

The settlers traveled across a narrow strip of land to reach the fertile valley.

The massive herd of buffalo grazed peacefully on the prairie grass.

Many famous explorers began their voyages during the fifteenth century.

The explorer hoped to find a new sea route to trade for expensive spice in the East.

Spices like pepper and cinnamon were in great demand among European merchants in the fifteenth century.

The explorers were willing to face dangerous storms to reach their destination.

European merchants were often willing to pay high prices for silk and spices from Asia.

The Spaniard led his crew across the ocean to reach the new world.

The Spanish explorers traveled to the Americas in search of gold and silver.

After the meeting in the capital, the explorers will proceed to the western territories.

The Spanish conquerors often chose to ignore the cultural traditions of the people they encountered.

The settlers believed they had the rights to own the land they cultivated.

The settlers decided to focus on building strong shelters before the winter arrived.

European nations wanted to colonize the Americas to increase their wealth and power.

The French explorers traveled deep into the interior of North America to trade for furs.

Jamestown became the first permanent English settlement in North America.

The English colonists struggled to survive in their first permanent settlement.

The British government passed several new tax laws during the 1760s.

The American colonists were tired of being ruled by a king who lived far away.

The colonists signed the document, and meanwhile, the war continued on the battlefield.

The Seven Years' War was a turning point that changed how Britain managed its colonies in North America.

The new government had to find a way to pay off the massive debt accumulated during the war.

Organisms can be classified by their cell structure and how they get their food.

All mammals have certain features in common, such as having hair or fur.

The animal kingdom includes everything from tiny insects to massive whales.

The Monera Kingdom consists of organisms that are so small they can only be seen under a microscope.

The Protista Kingdom consists of diverse organisms that are often microscopic.

Scientists name each new species according to a system of two-part Latin labels.

The zookeeper must take care of the animals by feeding them and cleaning their enclosures every morning.

Scientists often use Latin to give plants and animals their scientific names.

The Linnaean System allows researchers to categorize organisms based on their shared physical traits.

The main basis for classifying animals is their physical characteristics.

Sunlight, water, and air are the basic needs of most plants.

The root is an important part of a plant that helps it soak up water.

The main function of the roots is to absorb water and nutrients from the soil.

The strong roots of the tree hold the plant firmly in the soil.

Deep roots help to anchor a tree during a strong windstorm.

The farmer planted each seed carefully in the soft soil.

The flower is the main reproductive organ of the plant.

The stamen serves as the male part of the flower where pollen is produced.

The female part of the flower contains the ovary where seeds begin to grow.

The bee was covered in yellow pollen after visiting the sunflower.

The majority of plants on Earth produce seeds to grow.

A sunflower is a common example of a seed plant.

An apple tree is a common example of an angiosperm because its seeds are found inside the fruit.

A pine tree is a common example of a gymnosperm found in many cold climates.

A rose bush is a common example of a flowering plant found in many gardens.

Many mosses and ferns reproduce by using tiny spores.

Mosses and ferns are common examples of seedless plants found in the forest.

A fern is a common example of a vascular plant that thrives in damp forests.

A moss is a common example of a nonvascular plant found in damp forests.

Large plants like trees rely on vascular tissue to carry water high up to their branches.

The long roots of the desert flower are an important adaptation for finding water deep underground.

Plants often respond to the amount of sunlight they receive by growing toward the brightest area.

Sunflowers tend to face the sun throughout the day.

The sunflower displays a positive tropism by constantly turning its head toward the sun.

A plant's response to sunlight is to grow toward the window.

The Arabic numeral system is the most common way to represent numbers worldwide.

The number 45 has two digits.

The decimal system is the most common way to write numbers in the world today.

When you solve complex math problems, you may encounter large numbers that are difficult to add.

The clock in the town square uses a Roman numeral for every hour.

We are learning about geometry in our math class today.

The triangle must be constructed using only a compass and a straightedge.

A triangle is the simplest type of polygon with only three sides.

A circle is a perfect example of a closed figure.

A triangle is a simple example of a plane figure.

The blind poet Homer was a famous storyteller who recited the epic adventures of the Trojan War.

King Arthur is a famous legend from British history.

The legend says that the poet Homer was blind when he composed his famous epic poems.

The Iliad describes the intense fighting between the Greeks and the Trojans.

The student read the Odyssey to learn about the trials of the Greek hero.

The students are studying classic literature to understand how writers use figurative language.

When you are writing a science report, it is best to use literal language to avoid confusion.

The poem uses figurative language to describe the wind as a whispering ghost.

Writers often employ metaphors to create vivid images in the reader's mind.

The teacher praised the students for their creative solutions to the science problem.

Classical Art is known for its focus on beauty and perfect human proportions.

The architect was very influential in changing how modern cities were designed.

The artistic styles of the Greeks were highly influential in later eras.

The museum displays beautiful Greek pottery from the fifth century B.C.

The museum has a beautiful marble sculpture of a Greek hero.

We learned about the musical characteristics of the Baroque Period in our history class today.

The Classical Period is often celebrated for its elegant and balanced musical structures.

The Romantic Period is famous for its expressive piano compositions and large orchestral works.

The choir practiced the complex harmonies of the oratorio for several weeks before the concert.

The choir practiced the complex choral movements of the famous St. Matthew Passion for months.

The museum hired an expert to examine the ancient pottery shards.

The historian examined the ancient letters to understand the daily life of the soldiers.

The archaeologist discovered a collection of silver coins buried deep under the sand.

The detective searched the room for any clue that might explain what happened.

A diary written by a pioneer is an important primary source for historians.

The Declaration of Independence states that all people have certain inalienable rights, such as life, liberty, and the pursuit of happiness.

The Declaration of Independence mentions the pursuit of happiness as a fundamental right.

It is against the law to mistreat your pets by not providing them with food or water.

The committee decided to alter the original plan to include more public feedback.

The government decided to abolish the unfair tax after the people protested.

The United States is a democratic republic where citizens have a voice in the government.

The United States is a large democracy where citizens participate in the election process.

The United States is a republic where citizens elect their leaders.

Many citizens will vote for the candidate who shares their political views.

It is a great responsibility to vote for the next president of the United States.

Before the Civil War, Kentucky was considered a slave state.

Abraham Lincoln was elected to serve as the sixteenth president of the United States.

He was a vocal opponent of the new tax law that was passed last year.

South Carolina was the first state to secede from the Union in 1860.

The soldiers fighting for the Union wore blue uniforms.

The government worked hard to reintegrate the southern states into the Union after the Civil War.

The era of Reconstruction was a difficult time for the United States as it tried to heal the wounds of the Civil War.

The secret group planned to assassinate the king during the parade.

The political leaders often disagree on how to rebuild the country after the war.

The government worked hard to reunite the country after the Civil War.

As the smoke cleared from the factory, the tall smokestacks began to emerge against the sky.

Large corporations began to dominate the American economy during the period of rapid industrialization.

The government passed new laws to prevent any single company from forming a monopoly in the steel industry.

The government decided to enact a new law to protect workers in the factories.

The government passed a new regulation to ensure that factory working conditions remained safe for all employees.

The Industrial Revolution changed the world by making goods more affordable for everyone.

The meeting will take place in the main conference room tomorrow morning.

Most of the steel used for the new railroads would be manufactured by the state-owned ironworks.

The rapid growth of factories during the Industrial Revolution was made possible by new, efficient machinery.

The invention of the assembly line allowed for the mass production of affordable automobiles.

The global community works hard to fight against racism and promote equality for all people.

The country acted aggressively when it invaded the neighboring territory to seize resources.

The army planned to invade the neighboring country before dawn.

The Axis Powers fought against the Allied nations throughout the duration of World War II.

The military decided to launch a surprise attack to gain a strategic advantage.

A coral reef is a beautiful and complex ecosystem found in the ocean.

Living things in an ecosystem often interact with each other to find food.

The food web keeps the forest in balance by controlling the population of insects.

We had to jump over the puddle so we would not get our shoes wet.

A tree is a biotic factor that provides shade and food for many forest animals.

The tropical rainforest is a lush biome found near the equator.

The zebra grazed peacefully across the wide grassland.

The tundra is home to unique animals like the arctic fox and reindeer.

The taiga stretches across the northern parts of Canada, Europe, and Asia.

Many animals like squirrels and deer live in the deciduous forest.

The Earth has a thick outer layer made of solid rock.

The Earth's crust is much thinner under the oceans than it is under the continents.

The mantle is much thicker than the thin crust on the surface of the Earth.

The core is the innermost layer of the Earth.

The crust is the outermost layer of the Earth.

The atmosphere is essential for all living creatures on Earth.

The layers of gas surround the Earth to protect us from the sun's rays.

Oxygen is a common element that we need to breathe.

Nitrogen makes up the largest portion of the air we breathe every day.

After the students left the classroom, the remaining books were placed back on the shelf.

Scientists study the history of the universe to understand how matter was created.

Everything in our world is made of matter.

All forms of matter occupy space in the universe.

Everything that has mass takes up physical space.

Color and hardness are each an example of a physical property of a mineral.

You should stir the batter until it is smooth.

Salt will dissolve quickly when you stir it into a glass of hot water.

The metal will undergo a chemical reaction when exposed to acid.

Tearing a piece of paper is a simple example of a physical change.

Burning wood in a fireplace is a classic example of a chemical change.

The baby was very small at birth.

The tiny kitten was helpless when it was first born and needed its mother to stay warm.

Parents must take care of their children to ensure they grow up strong.

As children grow, they begin to perceive the world in more complex ways.

The baby began to crawl across the living room rug.

You must solve the equation carefully to get the right answer.

Addition is a basic mathematical operation that helps us find the sum of two numbers.

You must follow the order of operation to solve this complicated math equation correctly.

You must solve the addition inside the parenthesis before you multiply by the next number.

We learned about the Properties of Addition to help us solve the math problem faster.

The ratio of boys to girls in the classroom is two to one.

You can express the probability of rolling a six on a die in three ways.

When you see the ratio 3:4 on the whiteboard, you should read it as three to four.

The store is offering a fifty percent discount on all winter clothes.

The probability of winning is fifty percent; in other words, you have an equal chance of winning or losing.

The mother reached out to embrace her daughter after the long trip.

When the stranger reached out to grab her, she had to pull away from him to stay safe.

The thief tried to get away before the police arrived.

I would rather walk to school than take the bus.

After her best friend moved away, the girl felt completely grief-stricken and lonely.

The subject of the sentence should agree with the verb in number.

In the sentence 'The dog runs,' the word 'runs' is the predicate.

In the sentence 'She read a book,' the word 'book' is the object.

A noun is a common part of speech that names a person, place, or thing.

In the sentence 'She read a book,' the word 'book' is the direct object.

Many castles and cathedrals were built during the Middle Ages.

The Renaissance was a time of great creativity in painting and sculpture.

The city seemed to be reborn during the Renaissance as people rediscovered the beauty of classical art.

The rapid advance in printing technology helped spread new ideas across Europe.

The Renaissance sparked a new interest in Greek philosophy.

The orchestra played the final chord fortissimo, filling the entire concert hall with sound.

The orchestra practiced the new musical composition for several hours.

The conductor set the metronome to 120 beats per minute for the fast movement.

The composer added a tempo marking to indicate that the song should be played very quickly.

The piano student uses a metronome to make sure her playing stays at the right tempo.

During the Stone Age, early humans learned how to make fire to stay warm.

Historians study the Bronze Age to learn how early civilizations developed new technologies.

Archaeologists found many artifacts that date back to the Iron Age.

During the Old Stone Age, early people created basic tools by chipping rocks.

During the New Stone Age, humans developed agriculture and started living in stable communities.

The tomb walls were covered with beautiful hieroglyphics that told the story of the pharaoh's life.

The monks continue to practice their daily meditation rituals in the temple.

Many ancient civilizations in the Fertile Crescent practiced polytheism, worshipping gods associated with the sun, moon, and rivers.

The ancient priests climbed the steps of the ziggurat to perform their sacred rituals.

The ancient Egyptians used a calendar to track the yearly flooding of the Nile River.

The Indus River provided the water needed for farming in the ancient valley.

The modern-day map shows the countries of India and Pakistan where the Indus Civilization once thrived.

Archaeologists discovered many artifacts while digging at the site of the Indus Valley Civilization.

Historians often use the term the Harappan Civilization to describe the ancient society of the Indus Valley.

The merchants needed to gain access to the city's trade center to sell their goods.

Ancient Greece saw many city-states transition away from a monarchy to other forms of government.

Ancient Sparta was often described as an oligarchy because a small council of elders held most of the political power.

Ancient Athens is often remembered as the birthplace of democracy.

All citizens were encouraged to take part in the democratic process of Athens.

The Athenians built the Parthenon on top of the Acropolis.

The Punic Wars resulted in Rome becoming the dominant power in the Mediterranean.

The Roman emperor was the ultimate master of the vast Mediterranean territories.

The Roman Empire continued to take over many regions around the Mediterranean Sea.

The civil war lasted for many years and changed the government of Rome forever.

The volcano began to erupt, sending thick clouds of smoke into the sky.

The leader showed great kindness by sharing his wealth with the poor.

It is a moral duty to provide food and clothing to the needy in our community.

Many Muslims fast during the daylight hours of the holy month of Ramadan.

Many families gather to share a special meal after sunset during Ramadan.

Every year, millions of Muslims travel to Mecca to make a Hajj.

The invention of movable type allowed books to be mass-produced for the first time.

The new library was designed to be accessible to all students, including those with physical disabilities.

The building was previously a library before it became a museum.

The scientists had to come up with a new way to measure the stars.

The professor offered a new interpretation of the historical event that changed how we view the Renaissance.

The revolutionaries gathered in the street in any way they could to protest the king's taxes.

The scientist explained the basic concept of gravity to the students.

The King had to get approval from Parliament before he could raise taxes.

Many citizens were forced to leave their homes because of the revolution.

The American Revolution inspired many other nations to seek their own independence.

Scientists study genetic material to understand how traits are inherited from parents.

The mother cut the apple in half so that both children could have an equal share.

The union of a sperm and an egg results in a fertilized reproductive cell.

The nucleus is responsible for controlling the activities of the cell.

Genetic variation allows a population of plants to survive even when the environment changes.

The ocean water is very warm near the equator.

The small fish will move away from the shark to stay safe.

The Gulf Stream helps regulate the climate of many coastal regions.

Ocean circulation plays a critical role in regulating the Earth's climate by moving warm water from the equator toward the poles.

Rainfall helps to replenish the water levels in the local reservoir.

The scientist carefully cleaned the dirt out of the mold to reveal the shape of the ancient leaf.

The scientist carefully removed the rock to reveal the perfect cast of the ancient clam.

The woolly mammoth is an extinct animal that lived during the Ice Age.

Many species of animals began to vanish after the climate changed rapidly.

The paleontologist carefully brushed the dirt away from the dinosaur skull.

The skydiver jumped from the plane and enjoyed the view of the earth below.

A wooden block will float when you place it in a bucket of water.

The physics experiment measured how fast an object accelerates during freefall.

The skydiver pulled the cord to open her parachute before hitting the ground.

The race car's acceleration helped it win the competition.

A beam of white light can be comprised of all the colors of the rainbow.

There are billions of stars visible in the night sky through a powerful telescope.

Light can sometimes behave like a tiny particle traveling through space.

A single photon carries a specific amount of energy as it travels through space.

Light travels in waves through the vacuum of space.

The clouds began to darken the afternoon sky before the storm.

We stayed up late last night to watch the lunar eclipse from our backyard.

We used special glasses to safely watch the solar eclipse.

The moon's revolving around the Earth is what creates the cycle of lunar phases.

The location of the moon determines whether we see a solar or lunar eclipse.

When you have a cold, your nose produces more mucus to help trap viruses.

The doctor removed the foreign body from the patient's eye to prevent infection.

The glands in your mouth produce saliva to help you chew and swallow your food easily.

The stomach uses acid to break down food particles during digestion.

Even though the virus made him feel exhausted, he was able to manage to finish his school project on time.

A whole number is any of the numbers 0, 1, 2, 3, and so on.

To find a factor of 10, you can divide 10 by 2 to get 5.

If you divide ten by two, the number splits evenly.

When you divide seven by two, the remainder is one.

A composite number can be broken into smaller factors to help us understand its mathematical structure.

In geometry, a line is described as infinite because it extends in both directions without end.

A cube is a common three-dimensional figure that has six square faces.

A cube is a common example of a solid figure.

The cylinder rests on its circular base.

A cube has six identical square faces.

The famous sculptor spent months working on the marble statue of the ancient hero.

The main character in the myth is a sculptor named Pygmalion.

The story of Pygmalion explores the idea of an artist falling in love with his own creation.

Pygmalion was a talented sculptor who lived on the island of Cyprus.

He was not angry; he was merely surprised by the sudden change.

In the sentence 'The dog barked,' the dog is the subject.

In the sentence 'The cat sleeps on the rug,' the phrase 'sleeps on the rug' is the predicate.

A declarative sentence is the most common way to convey information in writing.

The lawyer asked the witness to make a statement about where she was on the night of the crime.

Many English questions end with a question mark.

The artist used flashy gold paint to make the frame stand out in the gallery.

Baroque painters placed a strong emphasis on dramatic lighting to create deep shadows.

The artist's new style would eventually lead to the birth of the Pop Art movement.

The Neoclassical Movement was heavily influenced by the archaeological discoveries in Pompeii.

Neoclassicism became popular as people began to admire the logic and structure found in ancient Greek architecture.

The music of the Middle Ages often featured beautiful vocal chants.

The choir made a tremendous effort to learn the complex medieval chants for the concert.

The monks lived in a quiet monastery located high in the mountains.

The monk spent his morning in the library copying ancient music manuscripts.

The musical composition was designed to be structured around a repeating melody.