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Publicado: 10 de enero de 2013
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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