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17 Cards in this Set
- Front
- Back
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what is plate techtonics |
ocean bottom is moving at rate about 5 cm a year |
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what is pangaea |
about-200 mil. year ago -where all the land masses grouped together formed vast supercontinent call pangaea |
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what is panthalassa |
about 200 mil years ago there are a single big ocean call pantahalassa |
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how nowadays continentals form? |
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the evidents that plate techonics happen in present time |
-the shrinking of pasific ocean and wider of atlantis and indian ocean -the widening of red sea |
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what is mid ocean ridge ? |
-where earth techonic ocean are gradually moving apart, cuz, -there are magma that rises to fill the gap |
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how plate interact with each other? |
techtonic activity -mountain building -volcanic activity -earthquakes |
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name 3 type of plate boundary |
1. divergence 2.convergence 3.transform |
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describe divergence plate boundary |
-seperating -the crust is sinking down as it streched -usually ocean plate and ocean plate -usually have volcanic activity -because the crust is torn apart -magma will fill the gap |
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name 3 sub- type of converging plate boundary |
-collide - have oceanic-oceanic plate -oceanic-continental plate -continental-continental plate |
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describe oceanic - continental -converging plate boundary |
-collision btwn oceanic and continental plate lighter crust (continental) will ride up over top denser crust (oceanic) -have volcanic activity -ocean trench developed -eg- peru-chile trench -andes mountain |
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describe oceanic - oceanic -converging plate boundary |
-collisions btwn oceanic plate - the lighter will ride over denser crust/ both will go down * needed edititng* -eg. mariana trench |
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what subducted mean? |
subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge. Regions where this process occurs are known as subduction zones |
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describe continental-continental converging plate |
collitions betwn continental plates -no subducted -make mountain range -where himalayan + european + indian plate meet |
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what is transfrom boundaries plate |
2 plate sliding horizontally -make faults -faults = the crack formed -eg- san andres |
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what is hydrothermal vent? |
-geyser at seafloor
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what hydrothermal vent do? |
-continously gushes hot mineral rich water that support diverse community of organisms happen 2100 meters undersea on mid ocean ridge system |
