Layer Of The Earth Flashcards
1
Q
Earth is…
A
Spherical
2
Q
Crust
A
- thin, solid outermost layer
- 1% Earths mass
- SIAL and SIMA
3
Q
Oceanic Crust
A
- Under oceans
- Basalt
- SIMA
- thin with high density
- 5-10 km
4
Q
Continental Crust
A
- continents
- Granite
- SIAL
- thick with low density
- 15-100 km
5
Q
Mantle
A
- zone of rock, 2’900’km
* 67%
6
Q
Lithosphere
A
Uppermost part of mantle and crust above it = cool and brittle
7
Q
Boundary between crust and mantle
A
MOHO plane
8
Q
Asthenosphere
A
Solid rock with the ability to flow due to heat and pressure
9
Q
Mesosphere
A
Increasingly dense and solid rock layer
10
Q
Boundary between mantle and core
A
OLDHAM discontinuity
11
Q
Core
A
- centre of earth
- iron
- magnetism and gravity
12
Q
Outer core
A
- dense liquid layer
* 2’250 km
13
Q
Inner core
A
- dense solid layer
* 1’228 km
14
Q
SIAL
A
- continental
- aluminum
- outer part of crust
- 15-100km
- lighter, less dense
- granite
- discontinuous
15
Q
SIMA
A
- oceanic
- magnesium
- inner part of crust
- 5-10km
- heavy, dense
- granite
- continuos
