1. Bell Ringer
Give at least one important characteristic of each of the four main layers of Earth. 1. 2. 3. 4.

2. Earth’s Interior
Earth’s interior is made up of several distinct compositional layers.

3. Crust Coolest Layer Hard, solid rock 1% of Earth’s mass Thin
Continental crust is thicker and less dense than oceanic crust.

4. Mantle Lies beneath the crust More dense than crust
80% of Earth’s volume
Magnesium, silicon,
iron, and oxygen

5. Core Iron and nickel 2 Layers Outer Core- liquid metal
Inner Core- solid metal

6. Feeling HOT, HOT, HOT
One reason why scientists think the interior is so hot is because of radioactivity.
Radioactive isotopes in Earths core decay and release energy in the form of heat.

8. Plate Tectonics
Alfred Wegener hypothesized that all of the continents might have been part of one landmass in the past before they drifted apart.
He pieced the continents together to form a super continent called Pangaea.

9. Alfred Wegener Use your laptops to research Alfred Wegener.
Where is he from?
When did he live?
Where did he attend school?
What was his career?
What did he propose?
What was his evidence?