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Theory of Plate Tectonics 108-111

Introduction p. 108

• Once scientists understood about mid-ocean ridges and magnetic reversals it was easier to understand how plate tectonic moved
•_______________________________ is the theory that the Earth’s lithosphere is divided into plates that move on top of the asthenosphere

Tectonic Plate Boundaries p. 108: Three types

•Boundary: place where tectonic plates touch other tectonic plates, all plates touch others
• Plate __________, ______________ or collide with one another
• Earthquakes can occur at all_____________________types of plate boundaries

Convergent Boundaries p 109


Convergent boundary: (3 types) when two tectonic plates collide at continent-continent boundary,continental-oceanic boundary or ______________ -_________________ boundary














Divergent Boundaries p 109

Divergent boundary occurs when 2 plates _______________________, then newsea floor forms where the divergent boundary space formed and filled









Transform Boundaries p 109

When two tectonic plates slide past each other horizontally,a___________ forms


Example: San Andres Fault in California, Pacific plate and North American plate slide past one another, not a smooth motion














Possible Causes of TectonicPlate Motion p 110: 3 causes of tectonic motion

The asthenosphere moves very slowly….
movement is due to changes in density caused by thermal (heat flow)
as rocks are heated,they expand and become less dense, rock near surface cools and become more dense and the rock sinks


_____________________________: at the mid ocean ridge, lithosphere is higher, thelithosphere slides down the slight “hill” created by the ridge due to _________


________________________: hot molten rock rises, cooler surface rock sinks causing the lithosphere to move sideways...
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