2. Explain CONVECTION in your own words.
2/26/2014
Explain CONVECTION in your own words.

3. Today’s Goal:
I CAN explain what plate tectonics is, what causes it, and forms from it.

4. Today’s Plan
Finish continental drift questions
Special demonstration (reward for students with finished work)
2. Vocabulary Practice

5. What are “Plates?”
The Earth’s Plates are a lot like the cracked shell of a hard boiled egg.
Earth’s LITHOSPHERE, its solid outer shell, is broken into pieces separated by jagged cracks.

6. And Subduction of Earth’s Plates
How Plates Move
Theory of Plate Tectonics:
Pieces of Earth’s Lithosphere are in slow, constant motion, driven by convection currents in the mantle.
This theory explains:
The Formation,
The Movement,
And Subduction of Earth’s Plates

7. Plate Boundaries Three types of Plate Boundaries:
DIVERGENT: Where two plates move APART.
-CONVERGENT: Where two plates come TOGETHER.

8. Plate Boundaries Types of Plate Boundaries:
TRANSFORM: Where two plates slide past each other, moving in opposite directions.

10. How the Plates Move
The movement of convection currents in the mantle is the major force that causes plate motion.

11. Convection Currents
Convection: When a fluid is heated and becomes less dense it rises, and when it cools down it becomes more dense and sinks

12. Convection happens in the ASTHENOSPHERE

13. Let’s take a closer look at how this works:
COOL by crust
Heat gives particles more energy and they spread apart becoming less dense
Particles lose energy, slow down and move together, becoming more dense
HEAT from core

14. Other contributors to plate movement
Ridge Push: gravity pulls oceanic lithosphere downhill, especially at mid-ocean ridges

15. Other contributors to plate movement
Slab Pull: oceanic lithosphere is more dense than hot asthenosphere, so the oceanic lithosphere will sink when it meets the asthenosphere

16. Other contributors to plate movement
Subduction: when one plate goes under another plate (part of slab pull at convergent boundary)

17. Vocabulary Practice
You need to write a definition AND draw/color a picture for each of the following 8 words:
Pages will help you. The picture should be ¼ of page. (So this will take 2 pages)
Plate Tectonics
Slab Pull
Divergent
Subduction
Convergent
Transform
Convection
Ridge Push