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Make Lightning Strike

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Photo Gallery: Cloud to Ground Lightning

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Feel the power of the mountain as you set an avalanche in motion. Then, come to understand the incredible forces that explain, and the conditions that cause, this unstoppable rush of snow.

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Earth's surface is made up of thousands of different habitats and ecosystems, all with unique characteristics. Can you tell the difference between a desert and a tundra? Know how much of Earth's surface is all wet?

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