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34 Cards in this Set
- Front
- Back
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Structure if the earth |
1. core 2. mantle 3. crust |
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What makes up the tectonic plates |
rigid lithosphere |
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lithosphere |
crust and upper part of mantle |
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lithosphere movement |
constant slow motion |
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arctic ridge |
2.5 cm/year |
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east pacific rise |
15 cm/year - the fastest |
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tectonics |
movement of lithosphere |
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crust |
where we live |
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crust is made out of: |
continental and oceanic crust |
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continental crust basics |
10-70 km
buoyant (less dense)
old |
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oceanic crust basics |
5 km
dense (sinks under contcrust)
young |
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continental crust descripts |
forms the land ave: 35 km |
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tip of the cont crust |
mountain ranges |
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granite |
oldest rocks |
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oldest rocks |
acasta gneisses, isua supracrustal, minnesota river valley, swaziland, western australia |
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acasta gneisses |
4.03 GA |
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isua supracrustal |
3.7/8 Ga |
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minnesota river valley |
3.5-7 billion years |
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swaziland |
3.4-5 billion years |
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western australia |
3.4-6 billion years |
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oceanic crust descripts |
made of basalt more dense not older than 200 myears |
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How do we know what the earth is made of? |
geophysical survey acquisition geological surveys |
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geophysical survey |
seismic gravity, magnetics, electrical geodesy |
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acqusition |
land, air,sea, satellite |
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geological surveys |
fieldwork, boreholes, mines |
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plate |
broken segments of the lithosphere |
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tectonics |
force/process that moves the lithosphere |
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plate tectonics |
causes the 12 major plates to collide/pull apart/scrape |
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word tectonic |
deformation of the crust as a consequence of plate interaction |
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basis of scientists dividing the lithosphere |
a) earthquake b) volcanism |
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earthquake |
1. will pinpoint which fault lines are active |
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importance of identifying areas prone to equakes |
to provide necessary precautions |
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volcano distribution |
majority r found along the edges of some continents |
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earthquake epicenters and volcanoes |
SAME LOCATION |
