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Some volcanoes erupt explosively, like opening a shaken soda bottle, because their magma is full of gases.
Reading

Find out what causes volcanoes to erupt and how scientists study them.
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Volcanoes, tsunamis, earthquakes... Examine how plate tectonics affect our world!
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If you marked every active volcano in the world on a map, you'd start to notice a pattern. Most of the world's active...
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Most volcanoes form along plate boundaries. But some of the world's largest and most active volcanoes are found far f...
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Jim is fascinated with volcanoes. He wants to know why some volcanoes erupt explosively, and how he might be able to...
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Granite is an igneous rock, which means it formed from magma, or melted rock. It forms deep inside the Earth under a...
Reading

Visit a scientist's lab to see how he creates a magma chamber!
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Igneous rocks form when magma, or melted rock from inside the Earth, cools and hardens. They can form above ground wh...
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The Earth is always changing. Mountains form and erode away. Volcanoes erupt and grow larger. Earthquakes shift the l...
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Ed Mathez has always been fascinated by rocks and the Earth. As a young boy, he went with his mother to old rock quar...
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Take an expedition across the Martian landscape with this video, then test your knowledge!
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When viewed from above, the wide-open sea is vast and flat. But venture below and you'll find a varied landscape that...
Reading

Water is a precious resource, and all things need water to survive.
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Venus and Earth are sometimes called sister planets because of their similar size, but don't let this comparison fool...
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Mars is often called the "red planet." It's red because its surface is covered with rusted particles of iron.
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Antarctica is like no other place on Earth. The continent is covered almost entirely by a thick ice sheet. Yet there...
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Obsidian doesn't look like your typical rock. In fact, it looks more like dark glass than a rock you'd pick up in you...
Hands-on

Send a note to a friend with these earthy letterheads.
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The plates that make up the Earth's crust are always moving. When two plates meet, the motion causes lots of pressure...
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If you look at a map, the coasts of South America and Africa seem to fit together like puzzle pieces.
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Test your knowledge about our planet Earth with this quiz.
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Deep inside the Earth, intense heat and pressure can change rocks into entirely new metamorphic rocks.
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These rocks provide the most clues about the history of life on Earth. 
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Deformed conglomerate is a metamorphic rock that has been changed by heat and pressure.
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On July 5, 1997, the six-wheeled robotic rover, Sojourner, rolled down a ramp from the Pathfinder spacecraft onto the...
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Early civilizations offered it to appease their gods. Ancient Egyptians placed it in tombs to support the dead on the...
Reading

Take a peek at our planet's layers, learn what secrets rocks reveal, and gain a long view of history.
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In satellite images of Earth's atmosphere, it's easy to spot the large, spiraling clouds of hurricane. These powerful...
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The Earth is our home. So far, it's the only place that we know of that has life. Everywhere you look on Earth there...
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If you ever go to Mercury, bring your sunscreen because it is the planet closest to the Sun. You'll also need a pair...
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Like many kids interested in science, Ro Kinzler thought she wanted to be a marine biologist. But later on, she reali...
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At the top of the world is a cold and icy area called the Arctic. It is made up of the Arctic Ocean and parts of Nort...
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There is nothing in the world like water. Without it, our world would be a very different place. Water covers over tw...
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George Harlow travels the world over to study how jade, rubies, and diamonds form. George wants to find out what thes...