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The forces that unleash earthquakes and volcanoes are among the most powerful in nature. Did you know that an earthquake can have 400 times the power of all the nuclear bombs ever exploded? Or that a single volcanic eruption can change the weather around the world? These pages offer plenty of fascinating facts to get you thinking, and that's just the start. You'll get a behind-the-scenes look at some amazing scientific discoveries in the "Inside Story" sections, or find out how to put some science to the test in the "Hands On" features. You can read up on a topic, and then jump straight to a related yet different one.