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Glossary

Protoearth

The early version of Earth as it was forming about 4.5 billion years ago, before it became the planet we know today.

ClownfishYellow FishButterflyfishSeaweedJellyfishTurtle
This word is used in the following lessons:
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Hands-On
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Flashback 4 Billion Years
It's time to travel back billions of years to discover how Earth and its oceans were first formed.
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