What is the circumference around the Earth?

What created most of Earth's Early heat?

Which description does not describe the Earth 4 billion years ago?

Why were the early oceans green?

What causes mantle material to move?

Describe the Earth 300 millions years ago.

Where are most diamonds found on the planet.

What group of animals became dominant after the extinction of the dinosaurs?

What process is responsible for making all of Earth's mountains?

When did the last Ice Age end?

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