The earths structure Flashcards
1
Q
What is the shape of the earth
A
Almost spherical
2
Q
What part of the earths layers do humans live on
A
The crust
3
Q
What is the order of the earths structure
A
Crust
Mantle
Outer core
Inner core
4
Q
How big is the earths crust
A
Varies between 5km and 50km
5
Q
What is the earths crust surrounded by
A
The atmosphere
6
Q
What takes place in the mantle
A
Radioactive decay
7
Q
What does radioactive decay do
A
Produces a lot of heat which causes the mantle to flow in convection currents
8
Q
What do we think the core is made of
A
Iron and Nickel
9
Q
What is the crust made up of
A
Tectonic plates
10
Q
What causes the plates to move
A
Convection currents
11
Q
How much do the plates move per year
A
A few cm
12
Q
Is it possible to predict when tectonic plates will move
A
No
