Chapter 8 Plate Tectonics

1
Chapter 8 Plate Tectonics

• Plate tectonics
• Earth has plates???

• The formation, movement and interactions of
  earths plates
• Rigid moving pieces of Earths crust, called.

2

• Lithosphere
• Asthenosphere

• Rigid, moving pieces of Earths crust and upper
  mantle
• Partially melted layer on top of which the
  lithosphere moves

3
(No Transcript)
4

• Continental drift

• Theory proposed by Alfred Wegener stating that
  the continents moved or drifted from one location
  to another over a period of time

5

• Common fossils on South America and Africa
• MESOSAURUS

• Evidence????

6

• Location of Earthquakes and Volcanoes.
• Located along plate boundaries
• Ring of Fire.ring of volcanoes earthquakes
  around the Pacific Ocean

7
Types of Plate Boundaries

• 4 types of plates boundaries

• Divergent
• Convergent/collision
• Subduction
• Transform/sliding

8

• 2 plates are moving apart
• Mid-ocean ridge

• Divergent
• Feature formed?

9
Example Mid-Atlantic Ridge
10
(No Transcript)
11

• Convergent/collision
• Feature formed?

• 2 plates slam together
• Mountains and mountain ranges

12
Example - Himalayas
13

• Subduction
• Feature formed

• One plate moves underneath another plate
• Trench

14
Example Marianas Trench Peru-Chile Trench
15

• Ocean- ocean plate
• Ocean continental plate
• Which plate subducts?
• What happens to it?

• The denser one (ocean)
• It melts!

16

• Transform/sliding
• Feature formed?

• 2 plates slide past each other
• Fault, like San Andreas

17
Example San Andreas