1.a structure of the earth Flashcards
How thick is the crust
50-70km thick
what is the crust also known as ?
The lithosphere
Crust extra facts
ontinental crust - land masses
Oceanic crust - beneath the ocean
Solid but can be brittle
How thick is the mantle
2,900km
Temperature of the mantle
1,000 - 3,7000 *c
Such high temperature causes convection currents - move deep mantle to shallower parts
What is the ade of ?
Magnesium, iron , silicon and oxygen → silicate rocks
Extra mantle facts
- Semi-molten in state (where magma is)
*Such high temperature causes convection currents - move deep mantle to shallower parts
What is the aesthenosphere?
Part of the upper mantle
**100-300 km down is asthenosphere → semi molten or viscous is capable of flowing slowly **
What is the mesosphere >
( harder and stronger) (most of the mantle) the mantle and the core mantle
What is the temperature of the outer core?
4,400*c
Extra facts outer core
- Less pressure
- Iron and Nickel
- More liquideous ( semi- molten)
How thick is the inner core?
Radius 1,220 KM
Temperature of the inner core
6000*c
What is the outer core made of
iron and nickel
What is the inner core made out of
iron and nickel
Is the inner core more solid then the outer?
Yes
What is continental crust made out of?
Silicon
Granite
Aluminium
What is the oceanic crust made out of ?
Basalt
Silicone
Magnesium
Is continental or oceanic crust more dense?
Oceanic crust as The chemical composition of oceanic crust results in a denser material when compared to continental crust
Which plate suburges beneath the other?
The oceanic crust is much more dense so sinks below the continental crust
How thick is the continental crust approximately?
70km
How thick is the oceanic crust approximately?
6-10km
