Composition of Earth

The Earth's interior is divided into a solid inner core, a liquid outer core, a solid (but flowing) mantle and solid crust. Because Earth's processes are dynamic and interactive in nature, the surface of the Earth is constantly changing. 
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Atmosphere | NASA Online
Atmosphere | NASA Online

Interactive

The Earth is surrounded by a thin envelope of gases called the atmosphere. More than 500 active volcanoes erupt around the world affecting the Earth's atmosphere and global climate.
Volcano | Eye Wonder

Video

The Eye Wonder team takes a look inside a volcano. D.V. visits Mount St. Helens, an active volcano in the continental United States, to learn how tectonic plates make a volcano, and what exactly...