Impact Craters

When a Metorite collides with Earth it can form an impact crater – a bowl – shaped hollow in the Earth’s surface. Space rocks have produced in this way throughout Earth’s life, especially when the planet was young, about 4 billion years ago.

Space rocks do not have to hit Earth to have a devastating effect. On june 30, 1908, there was an explosion 3.5 miles up in Earth’s atmosphere, above the unpopulated Tunguska River region of Siberia. It was caused by the disintegration of a small piece of comet or asteroid. The blast uprooted trees in a 12-mile area and was heard up to 600 miles away.

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