Oceanic vs Continental Crust Venn Diagram Oceanic Crust

Oceanic vs. Continental Crust Venn Diagram

Oceanic Crust • More dense • Made of mostly BASALT • 5 -10 km (3 -6 miles) thick • Younger/newer Continental Crust • Types of crust • Made of rock • Solid • Make up tectonic plates • Part of lithosphere • Moving • Less dense • Made of mostly GRANITE • 30 -50 km (20 -30 miles) thick • Older

Plate Boundaries Ch. 8 Goes along with foldable

Convergent – “Colliding” • Lithospheric plates are moving towards each other. FORMS: 1. Mountains 2. Trenches/Volcanic island arcs 3. Volcanoes on continents

Divergent – “Dividing” • Lithospheric plates are moving apart. FORMS: 1. Rift valleys on land. 2. Mid ocean ridges under water.

Transform – “sliding” • Lithospheric plates are sliding horizontally past each other. • Causes earthquake activity FORMS: 1. Faults

Plate Boundaries Chart Fill in chart row by row

Plate Boundaries Chart Type of Boundary Divergent Plate Boundary Sketch of Boundary Direction of movement Description/Fe atures of Plate Boundary Examples Away from each Continental: rift • Great Rift other valleys Valley in Africa Oceanic: sea • Mid-Atlantic floor spreading, Ridge rift valleys, mid- • East Pacific Rise ocean ridges (earthquakes)

Divergent Boundary

Great Rift Valley

Mid Atlantic Ridge

Mid-Atlantic Ridge

Plate Boundaries Chart Type of Boundary Transform Plate Boundary Sketch of Boundary Direction of movement Description/Fe atures of Plate Boundary Sliding Earthquakes, horizontally fault lines past each other Examples • San Andreas Fault in California • North Anatolian Fault in Turkey

Transform Boundary

San Andreas Fault

North Anatolian Fault

Plate Boundaries Chart Type of Boundary Sketch of Boundary Convergent Continent Plate Boundary Continent Collision Direction of movement Description/ Examples Features of Plate Boundary Moving towards each other Mountains (earthquakes) • Himalayan Mountains (still colliding) • Appalachian/ Ural Mountains (formed from past collisions)

Convergent Boundaries

Himalayans

Appalachian Mountains

Plate Boundaries Chart Type of Boundary Sketch of Boundary Convergent Ocean-Ocean Plate Boundary Subduction Direction of movement Description/Fe atures of Plate Boundary Examples Moving towards each other, one is subducting (sinking) Trenches & volcanic island arcs (on overriding plate) (earthquakes) • Mariana Trench & Islands

Ocean-Ocean

Mariana Trench/Islands

Plate Boundaries Chart Type of Boundary Sketch of Boundary Convergent Ocean. Plate Boundary Continent Subduction Direction of movement Description/Fe atures of Plate Boundary Examples Ocean plate is subducting beneath continental plate Volcanoes form • Peru-Chilean on continent , Trenches in • Andes ocean Mountains (earthquakes)

Peru-Chile

How Plates Move Notes page with 8 rectangles

Tectonic Plates • Theory developed in late 1960’s • In Greek Plate Tectonics means “one who constructs” • The tectonic plates are pieces of lithosphere that move on top of the asthenosphere.

Divergent Boundary • This boundary is responsible for creating new rock on the ocean floor known as “sea floor spreading” • Molten material rises between the cracks of plates.

Convergent Boundary • Plates are only moving a few centimeters per year, so collisions are slow and last millions of years • Mount Everest is the tallest mountain (29, 035 feet) created at convergent boundary.

Transform Boundary • Los Angeles and San Fransisco are moving towards each other at about 2 inches per year, in about 10 million years they will be side by side.

Ridge Push • As rock moves away from ridge it cools and slides downhill, which could help move rock away from ridge.

Slab Pull • The edge of a subducting plate is heavy and as it sinks into the mantle it pulls the rest of the crust down with it.

Convection Current • AKA Mantle Convection • Convection current is a cycle of heating, cooling, sinking magma. • As magma heats (less dense), it moves up, pushing against earth’s plates causing them to move. • When it cools it sinks (more dense) is heated and repeats the process all over again.

Plate Tectonics