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| Earth’s
most recent major ecological catastrophe... |
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| ...occurred
65 million years ago. |
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| The fossil
record changes abruptly before and after this |
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| moment. It indicates that the dinosaurs
disappeared at |
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| this
time. In addition, the majority of
other ocean and |
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| land animals went
extinct. |
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| What
happened? The evidence supports the
idea that |
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| the earth was
struck by an asteroid. Asteroids are |
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| constantly
colliding with planetary bodies, as evidenced |
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| by craters on
their surfaces. |
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