Question of the Day Question: List 4 pieces of evidence for plate tectonics. (Use your notes!) Answer: ……… Turn In: -Mystery of the Far Flung Fossils.

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Presentation transcript:

Question of the Day 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 Boundaries Locations: Mid-Atlantic Ridge (Middle of Atlantic Ocean) East African Rift Zone

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)