Transcript Bell Ringer

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