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A Geologic History of Earth

Earth is always changing. Lots and lots of years ago it looked very different than today. The shape of the land on Earth has changed. Earth’s climate has also changed.



More than 200 million years ago, all of the continents were in a big bunch together. They made one huge continent. This continent was called Pangaea.



Over time, the continents moved very slowly. They came to be where they are today. Still, scientists are pretty sure Pangaea happened.



They can tell it did because the continents all look like puzzle pieces. There are also lots of similar rocks on different continents. There are even similar fossils. This makes people think the continents were once closer together.



Earth’s climate has also changed a lot. Earth keeps going between very cold times and in-between times. A long time ago, it was very cold all over Earth. This was called an ice age.



Today, we are in an in-between time. It is not as cold as it used to be. Scientists still study the ancient ice ages. It helps them learn about Earth’s history.


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Questions
What is Pangaea?


A planet


An ocean


A gigantic continent from a long time ago


The Earth’s crust
How were the continents different in the past?


They were always covered by oceans.


They were smaller in the past.


A long time ago, they were all together in one big continent.


They were made of ice and not rock.
How does the Earth change? Pick two ways.


Over lots of years it can get much colder.


Continents can move very slowly.


It can become a different planet.


The Earth does not change.
Please answer all questions

Answer 1

1) A gigantic continent from a long time ago

2) A long time ago, they were all together in one big continent.

3) Over lots of years it can get much colder.
Continents can move very slowly.