earth Flashcards
1
Q
earths formation:
A
1) inner core
2) outer core
3) lower mantle
4) upper mantle
5) continental/ oceanic crust
2
Q
continental crust:
A
- forms the land
- made mostly of granite
- 30-50km thick
- less dense
3
Q
oceanic crust
A
- under the oceans
- made of igneous rock
- 6-8km thick
- denser
4
Q
asthenosphere
A
top layer of mantle
- very dense and thick
- partially molten and solid rock
5
Q
lithosphere
A
upper layer of the earth cool and brittle
6
Q
convection currents:
A
the heating, cooling, rising, sinking of the molten rock in the mantle causing movement.
7
Q
convection currents causes
A
the movement of tectonic plates
8
Q
continental drift
A
theory by alfred wegner
9
Q
divergent plate boundaries
A
two plates move apart
10
Q
convergent
A
two plates collide
11
Q
conservative
A
two plates slide past each other
12
Q
pangea
A
original super continent
13
Q
predict volcanic eruptions
A
tilt meters
air craft
14
Q
tilt meters
A
detects when a volcano swells up as it fills with magma
15
Q
air craft
A
measure amount of gas volcano gives off
