Transcript Inner Core

Layers of the Earth
Why are there different
layers of the Earth?
Earth is made up of materials
with different densities
density : Mass per unit volume
Let us Investigate Density
1) Put a layer of wooded beads about 1 cm
thick at the bottom of the cup
2) Put a layer of gravel about 2 cm thick on top of the
wooden beads. Stir the beads and gravel until they
are well mixed.
3) Put another layer of gravel about 1 cm thick in top
of the mix. DO NOT mix this layer of gravel.
4) SLOWLEY fill the cup about 2/3 full of water. Be
sure not to disturb the layers in the cup.
5) Stir the beads and gravel with the stick. Observe
what happens.
How do scientist think
the Earth was formed?
What do we already
know about Earth’s
Layers?
The Crust
Litho ~ “Stone”
 2 sections of the crust
- Continental Crust: (Granite Rock)
Made up of rock that floated to the
surface when the Earth was formed
Crust
How thick is the crust?
Divided into six continents. These
continents are Eurasia (Europe and
3 –Africa,
25 miles
Thick South
Asia),
North America,
America, Antarctica and Australia
-Oceanic Crust: (Basalt Rock)
The ocean floor.
Mantle
Outer Core
Inner Core
The Mantle
Asthenes ~ “Weak”
 The Earth’s thickest layer (1,700 miles)
 composed of a semi-solid
rocky layer that moves
Mantle
Top part of the mantel is cool and ridged
The lower section is made of hot rock
that moves like a thick paste
Convection Currents
The Core
Iron and Nickel
 Outer Core (1,411 miles)
Made of liquid molten rock called…..
Outer Core
Inner Core
 Inner Core (756 miles)
The solid metal core (or ball) of the Earth