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Q: How many mass extinctions have occurred in the past 4 billion years on earth?
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The Gradual changes that have occurred in the earth's structure during the past 4.5- 5 billion years is termed what?

evolutionary modification


The mass extinctions that occurred 250 million years ago and 65 million years ago may have been due to gradual process or?

A large comet or asteroid striking earth


When did scientists believe that chemical evolution occurred?

Scientists have believed that chemical evolution occurred about 4 billion years ago, shortly after the formation of the Earth. This process is thought to have led to the development of the first life forms on our planet.


What cataclysmic events have occurred in earth's history?

The Big Bang and The asteroid that hit the earth 1/4 billion years ago that supposedly killed off the dinosaurs.


What happened to the earth 700 billion years ago?

Earth did not exist 700 billion years ago, nor did the universe. Earth is about 4.6 billion years old.


Was the earth around 7 billion years ago?

No, the earth wasn't around 7 billion years ago. Earth formed about 4.6 billion years ago.


Will Earth be disintegrated in 2 billion years?

No, earth will not disintegrate in 2 billion years. We have about 5 billion years before the sun expands.


How old does scientific evidence suggest the Earth is?

== == The age of the Earth is roughly 4.6 billion years.


What 4.6 billion years is to the earth?

It is just a fact that earth is 4.6 billion years old.


Does the earth have 100 billion years?

No. The universe itself is about 13.7 billion years old. Earth is between 4.5 and 4.6 billion years old.


When will the earth turn 7 billion years old?

The Earth is currently 4.5 billion years, so in approximately 2.5 billion years time.


How old was earth when life appeared on it?

The Earth is about 4.5 billion years old. Life appeared on Earth about 3.5 billion years ago. The Earth would have been about 1 billion years old at that time.