The huge variety of plants and animals that live on Earth is called biodiversity. As ecosystems are destroyed by climate change and human activity, plants and animals are becoming endangered and even extinct. Find out how the loss of biodiversity affects food chains and natural habitats, why it is important to humans, and how its loss threatens the health of all living things on the planet.

The huge variety of plants and animals that live on Earth is called biodiversity. As ecosystems are destroyed by climate change and human activity, plants and animals are becoming endangered and even extinct. Find out how the loss of biodiversity affects food chains and natural habitats, why it is important to humans, and how its loss threatens the health of all living things on the planet.

Discover the biomes of our planet, from lush rainforests and sweltering deserts to deep oceans and fast-flowing rivers. See how seasons and climates vary across the globe, and find out about amazing animal and plant adaptations. Learn about people who live in different places around the world and the dangers that threaten our natural environment.

Climate change is reshaping the planet before our eyes. From melting ice caps and rising sea levels to drought and destructive hurricanes, no corner of Earth is protected from the effects of global warming. Discover the facts about what climate change is doing--and will continue to do--to our planet, and how we might reduce its impact. "About this title" may belong to another edition of this title.

Climate change is reshaping the planet before our eyes. From melting ice caps and rising sea levels to drought and destructive hurricanes, no corner of Earth is protected from the effects of global warming. Discover the facts about what climate change is doing--and will continue to do--to our planet, and how we might reduce its impact. "About this title" may belong to another edition of this title.

Learn about the kind of resources Earth holds, and how they are extracted and used. Discover the problems and challenges posed by human consumption of these resources, from overfishing to dwindling supplies of fossil fuels. Read about the efforts being made to protect Earth's resources, including finding sustainable energy solutions and making our cities eco-friendly.

Our modern world runs on energy to power our homes and industries. We all know the problems with burning fossil fuels to create energy-- it pollutes the planet and we are running out of these resources. Discover the facts about renewable and non-renewable energy resources, how our energy use contributes to global warming, and what the future of energy looks like. "About this title" may belong to another edition of this title.

Our modern world runs on energy to power our homes and industries. We all know the problems with burning fossil fuels to create energy-- it pollutes the planet and we are running out of these resources. Discover the facts about renewable and non-renewable energy resources, how our energy use contributes to global warming, and what the future of energy looks like.

Which innovative ideas and inventions began with the ancient Greeks? Find out how the ancient Greeks organized their society, trained their soldiers, used their ships for trade and transportation, and built their temples. Discover how their brilliant developments in architecture, politics, art, medicine, theater, and sports still influence the way we live today.

Which innovative ideas and inventions began with the ancient Greeks? Find out how the ancient Greeks organized their society, trained their soldiers, used their ships for trade and transportation, and built their temples. Discover how their brilliant developments in architecture, politics, art, medicine, theater, and sports still influence the way we live today.

Which innovative ideas and inventions began with the Anglo-Saxons? Find out how the Anglo-Saxons farmed their land, built their houses, and organized their society. Discover how their brilliant developments in defense, law, language, and storytelling still influence the way we live today.

Which innovative ideas and inventions began with the Anglo-Saxons? Find out how the Anglo-Saxons farmed their land, built their houses, and organized their society. Discover how their brilliant developments in defense, law, language, and storytelling still influence the way we live today. "About this title" may belong to another edition of this title.

Which innovative ideas and inventions began with the Maya? Find out how the Maya built their cities to suit the landscape and population, traded their resources, and developed a complex system of writing. Discover how their brilliant developments in farming, astronomy, and cloth-making still influence the way we live today.

Which innovative ideas and inventions began with the Maya? Find out how the Maya built their cities to suit the landscape and population, traded their resources, and developed a complex system of writing. Discover how their brilliant developments in farming, astronomy, and cloth-making still influence the way we live today.

Which innovative ideas and inventions began with the Romans? Find out how the Romans trained their soldiers, built their roads and buildings, and supplied their people with food and water. Discover how their brilliant developments in language, government, law, and entertainment still influence the way we live today. "About this title" may belong to another edition of this title.

Which innovative ideas and inventions began with the Romans? Find out how the Romans trained their soldiers, built their roads and buildings, and supplied their people with food and water. Discover how their brilliant developments in language, government, law, and entertainment still influence the way we live today.

Which innovative ideas and inventions began in the Stone, Bronze, and Iron Ages? These periods, stretching from the first ancestors of modern humans to the start of the ancient civilizations of Greece and Rome, was a time of amazing developments. Find out how making fire and tools, farming the land, and writing down symbols to communicate transformed society and had a lasting impact on the way we live today.

Which innovative ideas and inventions began in the Stone, Bronze, and Iron Ages? These periods, stretching from the first ancestors of modern humans to the start of the ancient civilizations of Greece and Rome, was a time of amazing developments. Find out how making fire and tools, farming the land, and writing down symbols to communicate transformed society and had a lasting impact on the way we live today.

Read about the things in our incredible world--landmarks, habitats and wildlife from the seven continents, dry deserts, huge oceans, mighty mountains, and much more. Then see if you can answer questions, such as: Which country is made up of over 6,000 islands? How many languages are spoken on Earth? What is the deadliest large land animal?

Read about the things in our incredible world--landmarks, habitats and wildlife from the seven continents, dry deserts, huge oceans, mighty mountains, and much more. Then see if you can answer questions, such as: Which country is made up of over 6,000 islands? How many languages are spoken on Earth? What is the deadliest large land animal?

Read about the different kinds of dinosaurs and other prehistoric creatures that lived long ago. Find out how they lived and died, how only their fossils remain, and much more. Then see if you can answer questions, such as: Why did the dinosaurs become extinct? Which dinosaur had the smallest brain? What can we learn from dinosaur footprints?

Read about the different kinds of dinosaurs and other prehistoric creatures that lived long ago. Find out how they lived and died, how only their fossils remain, and much more. Then see if you can answer questions, such as: Why did the dinosaurs become extinct? Which dinosaur had the smallest brain? What can we learn from dinosaur footprints?

Read all about science--super sound and light, exciting energy and electricity, incredible living things, fascinating forces, amazing inventions, and much more. Then see if you can answer questions, such as: What was the loudest known sound on Earth? Which animals can sense Earth's magnetic field? How can a solid be changed into a liquid?

Read all about our incredible universe, mysterious planets, exploding stars, brave astronauts, powerful rockets, and much more. Then see if you can answer questions, such as: Why does Mars look red? On which planet do clouds smell like rotten eggs? Who was the first living thing to orbit Earth?