1. Schedule for Today Greetings Expectations Rules are the same Homework
Plate Tectonics
Expectations
Rules are the same
Homework
Assignments
Tests
Icebreaker
Time for Class

2. The earth’s insides are comprised of both solids and liquids, depending on what layer you are in.
Each layer has a different composition and thickness.

4. The Crust (or Lithosphere)
Between 60 to 200 KM thick
The crust is not one big shell, it is divided into plates
All of these plates float on top of the layer just beneath the crust, known as the asthenosphere (or upper mantle)
Which is made up of molten lava
Think of each plate like a giant boat floating in the water
7 Major plates, with dozens of subdivided smaller plates

6. Upper Mantle or Asthenosphere
The boundary between the crust (lithosphere) and the upper mantle (asthenosphere) is known as the Mohorovicic Discontinuity (MOHO).
This is because of the change in density
About 75 to 250 KM below the earth’s surface
The layer of magma that the plates float on
Very goopy layer that is similar to melted plastic
Between 900 and 1600 ⁰C

7. Lower Mantle 700 to 2900km underneath the earth’s surface
500km gap between asthenosphere and lower mantle. Known as the transition zone (not important)
Solid rock
Pretty warm: ⁰ C
Guessing game for what it is made of
Scientists use remains from volcanic eruptions to determine its components

8. Outer Core & Inner Core Fascinating! Outer Core
2900 to 5270 KM underneath the earth’s surface
4000 to 5000 ⁰C
Liquid
Inner Core
Solid
5270 to 6370 KM underneath the earth’s surface
5400⁰C give or take
This is the same temperature as the surface of the sun..

9. Let’s Go on a Journey