layers of the earth
DESCRIPTION
i have used this ppt from someone and modified it for the use of my studentsTRANSCRIPT
Layers of the Earth
It’s not just a big hallow ball!
Layers of the Earth
If we cut it in half, it would have four different layers.
Layers of the EarthWhat is a good model of the earth?
Layers of the Earth
But first, the layers of an egg!
Shell
Albumen Layer“The White Part”
Yolk
Layers of the Earth
The Incredible (But Not Quite) Edible Egg!
Crust
Mantle
Outer CoreInner Core
Layers of the Earth
The Incredible (and absolutely inedible) Earth
Crust
Mantle
Outer CoreInner Core
Show your stuff!
What layer is
this?
What layer is this?
What layer is
this?
What layer is this?
CRUST
MANTLE
OUTER CORE
INNER CORE
CRUST
Made of SOLID ROCK
MANTLEMade of MELTED ROCK
OUTER CORE
Made of MELTED METAL
INNER COREMade of SOLID METAL
Why is it
SOLID?
TheSnowball
Effect!
The Crust• This is where we live!
• The Earth’s crust is made of:
Continental Crust- thick (10-70km)
- buoyant (less dense than oceanic crust)
- mostly oldOceanic Crust
- thin (~7 km)- dense (sinks under continental
crust)- young
How do we know what the Earth is made of?
• Geophysical surveys: seismic, gravity, magnetics, electrical, geodesy
• Acquisition: land, air, sea and satellite
• Geological surveys: fieldwork, boreholes, mines
Using Seismic waves