Bell Ringer Give at least one important characteristic of each
of the four main layers of Earth. 1. 2. 3. 4.
Slide 2
Earths Interior Earths interior is made up of several distinct
compositional layers.
Slide 3
Crust Coolest Layer Hard, solid rock 1% of Earths mass Thin
Continental crust is thicker and less dense than oceanic
crust.
Slide 4
Mantle Lies beneath the crust More dense than crust 80% of
Earths volume Magnesium, silicon, iron, and oxygen
Slide 5
Core Iron and nickel 2 Layers Outer Core- liquid metal Inner
Core- solid metal
Slide 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.
Slide 7
Slide 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.
Slide 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?
