The Earths Crust Flashcards
1
Q
The earths crust and the upper part of the mantle are what
A
Cracked into a number of tectonic plates
2
Q
What do convection currents do
A
Cause the plates to move at relative speeds of a few cm per year
3
Q
What can these movements be
A
Sudden of disastrous
Earthquakes and volcanic eruptions occur at the boundaries between to tectonic plates
4
Q
What does the earth consist of
A
Core
Mantle
Crust
Surrounded by the atmosphere
