8.2Types of plate boundaries

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Presentation transcript:

8.2Types of plate boundaries Explain how each type of boundary moves. How are the 3 kinds of convergent boundaries different? Objectives:

Types of plate boundaries 3 main types Divergent Convergent Transform

Divergent boundaries Divergent boundary (aka spreading center): a boundary between 2 lithospheric plates that are moving apart

Divergent boundaries Cont’d Most are in the ocean Have rift valleys deep valleys at the center of a mid-ocean ridge Molten rock forces its way up through cracks (rifts) Older crust is pushed away from the mid-ocean ridge

Divergent boundaries Cont’d Fracture zones: broken segments in the lithosphere that are perpendicular to the ridge

Convergent boundaries A boundary between 2 plates that are moving toward each other Subduction boundary Collision boundary

Subduction boundaries Subduct: when the denser plate moves under another plate Subduction boundary: boundary between 2 plates where one plate is pulled beneath another Deep-Sea Trench: forms along this boundary when 2 oceanic plates converge Deepest part of the ocean has a chain of volcanic islands (volcanic island arc) on the upper plate

Subduction boundaries Cont’d When oceanic and continental plates converge, the denser oceanic plate is subducted A deep-sea trench is formed Mountain chain and volcanoes form on the upper continental plate

Collision boundaries If 2 converging plates have continents then they may be pushed together to make a larger continent Collision boundary Causes the Earth’s crust to move upward to form mountains https://www.youtube.com/watch?v=HuSHOQ6gv5Y

Transform Boundaries A boundary between 2 plates that are sliding past each other Does not move at the same rate San Andreas Fault https://www.youtube .com/watch?v=ZxP TLmg0ZCw&spfrel oad=10 https://www.youtube .com/watch?v=hq R2_sHDfvs

8.2 Exit Ticket Answer the following questions. Use complete sentences. You may NOT use your book. You MAY use your notes. This is a quiz grade. Explain how each type of boundary moves. How are the 3 kinds of convergent boundaries different?