1. Take out hwk. Get a packet off bookshelf
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Take out hwk.
Get a packet off bookshelf

2. You will learn to recognize features caused by plate tectonics.
Section 4.3
Theory of Plate Tectonics
Objectives:
You will learn to compare and contrast divergent, convergent, and transform plate boundaries.
You will learn to describe how heat inside Earth causes plate tectonics.
You will learn to recognize features caused by plate tectonics.

3. Plate Movements!!! plate tectonics
– ____________ theory was developed
- ____________ – states the Earth’s _____ and upper ______ are broken into sections
- sections are called _____ and they move around the ______
plate tectonics
crust
mantle
plates
mantle

4. Composition of Earth's Plates!!!
- __________ - plates are composed of the crust and a part of the upper mantle
- ____________ - plastic-like layer below the lithosphere
lithosphere
asthenosphere

5. 1. Divergent Plate Boundary ______________________
Plate Boundaries!!!
1. Divergent Plate Boundary
______________________
2. Convergent Plate Boundary
3. Transform Fault Boundary

6. 1. Divergent Plate Boundary
- _________________ – the boundary between ____ plates that are moving ______ from one another
_______________
divergent boundary
two
apart
Examples:
Mid-Atlantic Ridge
Great Rift Valley

7. 2. Convergent Plate Boundary
______________________ – the boundary between ____ plates that are moving ________ each other
3 kinds of convergent plate boundaries:
convergent plate boundary
two
towards
ocean – continental
________________________________________________________________________
ocean – ocean
continental - continental

8. Ocean - Continental
- ____________ - the area where an ______ plate ________ into the upper ______ in this kind of collision
- ________ occur above subduction zones
subduction zone
oceanic
descends
mantle
volcanoes

9. 3. Transform Fault Boundary
- ________________________ – the boundary between ____ plates that _____ past one another and are moving in ________ directions or in the same direction at different ______
- _____________ are a result of transform fault boundaries
- the Pacific Plate is sliding past the North America Plate, forming the famous _________________
two
slide
opposite
rates
earthquakes
Example:
San Andreas fault

10. Causes of Plate Tectonics!!!
convection
1. ___________ ________ – the cycle of heating, rising, cooling, sinking
2. differences in ________ are the main cause of this cycle to occur
currents
density

11. Effects of Plate Tectonics!!!
1. mountains
___________________________
2. rift ocean basins
3. volcanoes
4. earthquakes

12. Let’s Review!!! What does the theory of plate tectonics state?
What makes up the lithosphere?
What is located below the lithosphere?
Name the three kinds of plate boundaries.
Which type of plate boundary causes earthquakes to occur?
Which type or plate boundary causes volcanoes to form?