Our Restless Planet

1
Our Restless Planet

• Chapter 33

2
Check Your Neighbor

• How can coal deposits exist in Antarctica?

3
Objectives

• Define Continental Drift
• Describe The Theory Of Seafloor Spreading
• Describe The Theory Of Plate Tectonics

4
Key Terms

• Pangaea a single land mass that existed in the
  geological past and was composed of all the
  present day continents
• Paleomagnetism Magnetic North and South poles
  reversed. Rocks that display natural magnetism
  and which are used to determine the intensity of
  the earths magnetic pull.
• Seafloor Spreading The moving apart of two
  oceanic plates to form a rift in the seafloor
• Mantle The middle layer of the Earths
  interior, is between the crust and the core.

5
Mantle
Crust
Mantle
Core
6
Theory of Continental Drift
7
The Theory of Continental Drift
8
Spreading Seafloor
9
Check Your Neighbor

• Is the Earth expanding?

10
Types of Faults
Transform
Convergent
Divergent
                                                
                                                  
                                         
11
Mid Atlantic Ridge
12
hydrothermal vent

• A hydrothermal vent is a geyser on the seafloor

13
Earth Science Website

• http//www2.nature.nps.gov/geology/tour/index.htm