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Earth is not just a static sphere. The lands and seas have dramatically shifted and changed through time just as much as the climate has changed.

Find a very handy doodle lecture explaining the basic mechanics and observations that support Plate Tectonics here.

They also have a variety of videos going into more detail.

Pangea animation 03

Earliest dinosaurs lived on Pangea, a super-continent that has been spreading apart for the last 200 million years.

Geologic Clock with events and periods

Events in Earth's history illustrated as portions of a clock face. (Illustration public domain).

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