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Question: List 4 pieces of evidence for plate tectonics. (Use your notes!)

Answer: … … …

Turn In:-Mystery of the Far Flung Fossils-p. 566 CYU’s 1 - 7

Types of Plate Boundaries

The Earth’s crust

• Can be classified into two types (continental & oceanic)

• Is split into smaller pieces called plates

• Plates sometimes run into each other

• Magma circulating in the mantle moves them around

Mantle Convection

• Differences in temperature cause material to circulate

Plates are Pushed & Pulled

Draw This Divergent Plate Boundary

Divergent Plate Boundary

• At a divergent plate boundary, two plates move apart

• Starts on land as a rift valley

• Ends up as a mid-ocean ridge (after millions of years)

Divergent Boundary Formation

Divergent Boundary Formation

Divergent Boundary Formation

Divergent Boundaries

• Locations:•Mid-Atlantic Ridge (Middle of Atlantic Ocean)

• East African Rift Zone

Convergent Plate Boundary

Convergent Plate Boundary

• Where two plates move together

• There are 3 types of convergent plate boundaries

Converging Oceanic/Continental

• An oceanic plate and a continental plate meet

• The denser oceanic plate sinks underneath the continental plate

• Called subduction

• Produces volcanoes on the continental plate

Draw this Oceanic/ Continental Convergent Boundary

Converging Oceanic/Continental

• Locations– Washington and Oregon (Cascade Mountains)– Andes Mountains (South America)

Converging Oceanic/Oceanic

• Two oceanic plates meet

• The oceanic plate with older crust is colder so it is – A. Less Dense– B. Denser– C. Thicker– D. Hotter

Converging Oceanic/Oceanic

• Two oceanic plates meet

• The oceanic plate with older crust is colder so it is – A. Less Dense– B. Denser– C. Thicker– D. Hotter

Converging Oceanic/Oceanic• It subducts underneath the less dense plate

• Volcanoes form on the upper plate– Draw this:

Converging Oceanic/Oceanic

• Locations:– Japan– The Philippines

Converging Continent/Continent

• Two continental plates with the same density meet

• True or False: – Subduction can occur?

• FALSE!

– Volcanoes can form?• FALSE!

– Mountains form?• TRUE!

Converging Continent/Continent

India Collides with Asia

Converging Continent/Continent

• Locations:– Himalayas (between India and China)

Draw This Transform Plate Boundary

Transform Boundary• Where two plates move past each other• Location: California (San Andreas Fault)

Hot Spots

• Occur in the middle of plates (not a plate boundary)

• Very hot area of mantle (Mantle plume) melts through the crust

• Stationary (never move)

• As plate moves, mantle plume will melt several holes in the crust, forming a chain of volcanoes

Hot Spots

Seamounts and Plate Movement

Hot Spot Locations

• Hawaii• Wyoming (Yellowstone National Park)