Theory of Continental Drift

Three Types of Plate Boundaries:

• Divergent—Boundary where plates move apart (ex: Great Rift Valley—Africa; Mid ocean Ridges)
• Convergent—Boundary where plates come together (ex: Himalayan mountains,
• Transform—Boundary where two plates slide along side each other (ex: San Andreas Fault—San Francisco)

• Strike-slip or transform boundaries occur where two plates slide along side each other. Earthquakes occur in these areas (Ex: San Andreas Fault in California).

• Transform Boundary

• San Andreas

• Plate Movements

• Hot Spots The Hawaiian Islands do not occur by a plate boundary. These islands form as the Pacific plate moves over a hot spot in the mantle.

• Hot spot or Mantle Plume

• Earth Observatory

What will the Earth look like in the future?

• Present Day Earth