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Geosphere 1 (Origin of earth layers: (4500 million years ago (Cooling…
Geosphere 1
Origin of earth layers:
4500 million years ago
Cooling
more dense material sank and formed the core
over the core we have the mantle
and over the mantle we have the crust
Earth layers more detailed
In the last part we have the core
over the core the mantle
the outer part is the crust
the asthenosphere take a part of the mantle and a part of the core
crust
is the thin, rocky layer
we think of as the Earth's surface
it is the thinnest layer
from 80 kilometers to 5 kilometers
composition of the crust
Oxigen
46.6%
Aluminum
8.1%
Iron
5%
Silicon
27.7%
Calcium
3.6%
Sodium
2.8%
Potassium
2.6%
Magnesium
1.5%
inner core
it is a solid ball made up of mostly two metals
iron
nickel
6000 miles bellow the earth's surface
mantle
this layer ir rock-hard
actually flows arround the outher core
it is moving about
as slowly as your finger nails grow
outer core
this layer is also mostly made up of
iron
nickel
but the metals are melted
into a very hot liquid
this hot liquid forms a layer
that moves arround the inner core
