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Flashcards in The Earths Crust Deck (4)
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1

The earths crust and the upper part of the mantle are what

Cracked into a number of tectonic plates

2

What do convection currents do

Cause the plates to move at relative speeds of a few cm per year

3

What can these movements be

Sudden of disastrous
Earthquakes and volcanic eruptions occur at the boundaries between to tectonic plates

4

What does the earth consist of

Core
Mantle
Crust
Surrounded by the atmosphere