1. Layers of the Earth

2. Questions Describe the main layers of the Earth:
Crust
Mantle
Outer Core
Inner Core
Describe the sublayers of the Earth
Lithosphere
Asthenosphere
Mesosphere
Draw a picture of the layers of the Earth

3. Objective
Compare and contrast the different layers of the Earth

4. The Earth The Earth is not the same all the way through
There are different layers
Each layer can then be split into other layers

5. The Big Picture There are 3 main layers inside the Earth Crust Mantle
Core
Outer
Inner

6. The crust The crust The layer that we live on
Very thin at only 3-60 miles thick
We’ve only ever dug about 7 miles below the Earth’s surface
Not very dense
The crust floats on top of everything
Two types of crust
Oceanic (which is thin)
Continental (which is thick)
Only 1% of Earth’s entire mass
Earth weighs 1.3 x 1025 lbs

7. The mantle The mantle The thickest layer at1800 miles thick
Contains 67% of Earth’s mass
We’ve never actually drilled down far enough to see it
It’s a solid, with the texture of silly putty
VERY hot, with lots and lots of pressure
We couldn’t visit—it would kill us

8. The core Outer core Inner Core-
The layer between the mantle and inner core
1370 miles thick
Made of liquid iron which was mapped using earthquake waves
30% of Earth’s mass
Inner Core-
The very center of the Earth
760 miles thick
Made of solid metal iron that swirls around
Extreme heat and pressure (12,000 degrees)
2% of Earth’s mass

9. The core
All together, the inner and outer core are slightly larger than the planet Mars

10. Structure of the Earth
The Earth is further divided into several layers, each of which has different properties
Each layer isn’t the same all the way through

11. Further layers of the Earth
Lithosphere
Means “rock sphere”
Made of the crust and the rigid upper part of the mantle
This is the part of the Earth we live on
Divided into tectonic plates

12. Further layers of the Earth
Asthenosphere
Means “weak layer”
Soft part of the upper mantle that moves pieces of the lithosphere
Made of solid rock
It’s like silly putty!
Moves as fast as your fingernails grow

13. Further layers of the Earth
Mesosphere
Means “middle sphere”
The strong, thick lower part of the mantle

14. Layers of the Earth Lithosphere Asthenosphere Outer Core Inner Core
Mesosphere

15. Video What would happen if you fell through the Earth?
What’s on the exact opposite side of the world

17. Layers of the Mantle and Core
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