Plate tectonics Draw and build with me .

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Plate Tectonics.

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Presentation transcript:

Plate tectonics Draw and build with me 

http://www. enchantedlearning http://www.enchantedlearning.com/subjects/astronomy/planets/earth/Continents.shtml

Continental Drift Continents seem to fit like a puzzle Fossil evidence of reptiles on different continents Fossil evidence of plants on different continents Climate evidence on different continents Mountain evidence on different continents

Plate tectonics

Question Draw or Explain what causes plates to form and move? Convection

Seafloor Spreading 6

Earth’s Structure : CRUST -very thin -3-30 miles

MANTLE Lower mantle : semi- rigid Upper mantle: flowing 2000 miles thick

CORE outer core: Liquid Inner core : Solid 2000 miles thick

CRUST TYPES CONTINENTAL 3-4 miles thick OCEANIC 20-30 miles thick Less dense

Divergent oceanic Example : Mid- Atlantic Ridge Glue/ tape pieces A, B, C Effects: - Forms crack in current crust from melting. - Magma fills crack -New crust is formed MAGMA

Plate tectonics

Divergent Continental Example: RED SEA Effects: -Fractured into a rift -central blocks slide down -earthquakes occur - Area fills with water

Plate tectonics

Red Sea

Convergent: Oceanic/ Continental Example: Washington/ Oregon coastline COOL WARM HOT Effects: -crust sinks and heats up -produces magma chambers -magma chambers are less dense and rise - Magma reaches surface and gives volcanic eruption Glue/ tape G, H, I

Plate tectonics

Convergent: Oceanic/ Oceanic Example: Japan and Eastern Caribbean COOL WARM HOT Effects: -one plate goes under other (older plate) This is heated and forms magma chambers -Magma chambers rise and when they reach top of crust form a volcano -volcano can start below ocean surface and build to be above it. Glue/ Tape D, E, F

Plate tectonics

Convergent: Continent/Continent Example: Himalaya and Appalachian mountains - Put 40 mil, inside 60 mil inside, 80 mil. -cut down solid lines of 60 and 80 mil - Tape tabs on back together. Effects: -Folding -Faulting -Mountain Ranges -Earthquakes

Plate tectonics

Himalayan Mountains

Transform Boundary Example : San Andreas Fault Effects: -Earthquakes -faulting

Plate tectonics

San Andreas Fault