Download Inside the Earth

Inside the Earth
Layers of the Earth
• Crust
• Mantle
• Core (inner & outer)
The Crust
•
•
Outermost layer
2 Types of Crust
1. OCEANIC
a)
b)
c)
d)
very dense
Solid
made of Basalt
8 km thick
2. Continental
a)
b)
c)
d)
The least dense
Solid
made of Granite
32 km thick
Oceanic and Continental Crust
The Mantle
• Middle layer of earth
• Solid with plasticity
• Made of iron,
magnesium, oxygen,
and silicon.
• Thickest layer, 2900
km
• Makes up 2/3 of the
Earth’s mass
Outer Core
• Liquid
• Made of Iron and
Nickel.
• 2250 km thick
Inner Core
• Solid
• Made of Iron and
Nickel
• 1300 km thick
Earth’s Layers
• How are the earth’s
layers similar to an
egg?
• Shell=crust
• Egg white=mantle
• Yolk=core
Lithosphere
• Lithosphere = Crust +
Upper Mantle
• Solid
Middle Mantle - Asthenosphere
• Upper part of the
middle mantle is the
Asthenosphere.
• Convection
currents – occur in
the asthenosphere.
Very hot material at
the deepest part of
the mantle rising,
then cooling and
sinking again -repeating this cycle
over and over.
Convection Currents