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a scientific theory that describes the large scale motions of the Earth's plates which make up the lithosphere. These plates rest on the asthenosphere.

 It is believed that tectonic plates are moved by several different forces: ◦ Rotation of the earth ◦ Tidal forces of sun & moon ◦ Gravitational pull ◦ Convection cell ◦ Plates move at a rate about 2 to 5 centimeters per year. (About the same speed that your finger nail grow) WOW!

Developed the theory of Pangea & Continental Drift. Alfred Wegener (VAY guh nuhr)

Direction of plate drift

 Convergent  Divergent  Transform

There are 3 types of convergent boundaries, all 3 cause VERY strong earthquakes.  Oceanic>Continental ◦ Volcanoes ◦ Oceanic trenches  Oceanic>Oceanic ◦ Tsunamis ◦ Volcanoes ◦ Island arcs  Continental>Continental ◦ Mountain building

Tectonic Plate Motion

There are 2 types of divergent boundaries that earthquakes.  Sea Floor Spreading ◦ Oceanic Ridges  Continental Rift ◦ Rift Vallies

Tectonic Plate Motion

three plates are pulling away from one another: the Arabian Plate, and the two parts of the African Plate(the Nubian and the Somalian) Rifting earth of Ethiopia

A transform boundary is just that, a transform boundary.  Transform boundaries can have jagged edges that get caught on each other, when this happens massive pressure builds up which releases in a Powerful Earthquake.  Small mountains form right on the fault line.

Tectonic Plate Motion

Border of the Pacific & North American plate, 810 miles long. Arial photo of the San Andreas Fault

 On a separate sheet of paper, identify the three types of plate boundaries. Use arrows to identify the direction of movement.