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Sixty-five million years later, the extinction of the dinosaurs remains a great mystery. Scientists
think that dinosaurs existed on Earth for almost 200 million years. 19 could these great beasts,
some of which weighed thousands of pounds and stood 100 feet tall, suddenly disappear?
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The most popular theory is that the dinosaurs were killed off when an asteroid into
southern Mexico. The asteroid's collision caused earthquakes, fires, and tidal waves. Volcanoes
erupted, spewing poisonous gases into the sky and lowering the oxygen level in the oceans. Plants
died, removing the food source for plant-eating dinosaurs. As these dinosaurs died, there was no food
for meat-eating dinosaurs. In a short period of time, the dinosaurs were gone, and the first mammals
began to appear.
Many scientists note that,
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the asteroid had a major impact, the Earth's climate had already
scientists claim that mammals already on Earth before the asteroid might have 22 the extinction
begun to change. The planet was cooling, and the colder temperatures were likely killing plants. Some
by eating dinosaur eggs.
We may never know for certain what caused the extinction of the dinosaurs. But it was most
likely the result of a combination of the asteroid, colder climates, and egg-stealing mammals 23
the single event of the asteroid hitting the Earth.
2024ๅนดๅบฆ
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Casey Malarcher et al., Reading for the Real World 1, Second edition
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