many scientists think that 65 million years ago, s l i …dinosaurs were not the only group of...
TRANSCRIPT
MD 2009
What happened What happened What happened What happened What happened What happened What happened What happened to the dinosaurs?to the dinosaurs?to the dinosaurs?to the dinosaurs?to the dinosaurs?to the dinosaurs?to the dinosaurs?to the dinosaurs?
The age of the dinosaurs lasted for about 165 million years. Then they all died out. When a group of animals die out we say that they became extinctextinctextinctextinct.
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All that is left are fossils.
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Many scientists think that 65 million years ago, a huge chunk of space rock smashed into Earth.
They think it hit Earth so hard that it was like an explosion.
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What happened to destroy all some of the biggest animals that ever lived?
There are many ideas besides the idea that they were killed by a giant lump of rock, a meteorite, falling to Earth.
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deSome scientists think that volcanoes could have erupted and choked the dinosaurs to death.
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dePerhaps plagues of animals ate all the dinosaurs’ eggs.
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deMaybe all the dinosaurs became infected with diseases that killed them.
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Perhaps a giant tidal wave drowned the dinosaurs.
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dePerhaps the climate changed and the dinosaurs couldn’t adapt to the changes.
Maybe the water became poisoned by bacteria (germs) which slowly poisoned the dinosaurs.
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deThe only thing we know for sure is that there are dinosaur fossils in the rocks up to 65 million years ago, but there are none after that time.
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deNo one really knows why some reptiles survived but the dinosaurs didn’t.
From 65 million years ago there were no dinosaurs left. Dinosaurs were not the only group of animals to become extinct at that time. Some of the flying reptiles also died. Other reptiles survived.
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There may be no dinosaur fossils after that time but there are fossils of other creatures that showed they survived.
After the dinosaurs all died out, insects, worms, fish, birds and mammals all survived. Mammals are animals that give birth to live babies.
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deNew kinds of plants and animals appear, do well for a time and then die out as even more new kinds appear. These changes in living things are all natural and have happened ever since life first began on Earth.
This slow change of living things over time is called evolutionevolutionevolutionevolution. Without evolution, we wouldn’t be here!Sa
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