Download Inside the Earth

Layers of the Earth
Directions
Take detailed notes about the different
layers of the earth.
Be sure to include:
• A Title
• Subtitles For Each Topic
• Drawings Where Applicable
Let’s start with
Earth’s Common Four Layers
These are the layers you learned about last
year.
They are based on the composition of each
section of the Earth.
Composition (What it is made of)
•
•
•
•
Crust
Mantle
Outer Core
Inner Core
The Crust
• Outer most layer
• 5-100 km thick (the
thinnest layer)
• 2 types of crust
– Oceanic (very dense)
– Continental (less
dense)
• Made of oxygen,
silicon, aluminum,
iron, & magnesium
Oceanic and Continental Crust
The Mantle
• Middle layer
• Very thick layer
• Mostly iron &
magnesium
The Core
•
•
•
•
•
Outer core is liquid
Inner core is solid
Made mostly of iron
1/3 of the earth’s mass
Extremely hot
There is another way to look at
the layers!
Tectonic Plates
These layers
are based on
movement
(mesosphere)
Physical Structure of the Earth
(5 Layers)
• Lithosphere- rigid hard outer layer that makes
up the plates (includes the crust & top mantel)
• Asthenosphere- amorphous solid rock that
flows slowly like putty (top part of the mantel)
• Mesosphere- strong middle layer of Earth
(lower mantel)
• Outer Core- liquid layer made mostly of iron
• Inner Core- solid, very dense, made mostly of
iron
Let’s Compare
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