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| what are three evidences of a terrane? |
1. bounded on all sides by major faults
2. foreign rocks and fossils
3. foreign magnetic polarity |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| how is there coal in antarctica? |
although antarctica has no plants, it could have had a warmer climate when it was part of pandaea |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| describe the north american craton |
it shows the approximate shape of the continent 2.5 billion years ago |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| how was the mariana trench created? |
when the pacific plate subdeucted under the philippine plate. |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| how are faults created? |
at the boundaries of some areas, the lithospheric plates slide past eachother, causing faults. |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| where does the pattern of magnetic polarity, mid-ocean ridges, and heat flow occur? |
diverging boundaries |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| what does subducting mean? |
to pull or draw downward |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| what are spreading centers? |
the place in lithospheric plates where lava wells up, creating new rocks, that push older rocks away. |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| how are earthquakes and volcanoes related to plate boundaries? |
the belts where earthquakes and volcanoes are located mark where the plate boundaries are |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| what is the continental drift theory? |
the theory of continental drift is the suggestion that africa and south america was once one continent, but broke and moved apart. |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| what is convergent boundaries: subduction? |
one plate plunges underneath another forming a deep sea trench or volcanic islands
ex. mariana trench and mariana islands formed from the pacific plate subducting under the philippine plate |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| what is convergent boundaries: collision? |
land is pushed upward to form mountain ranges
ex. himalayas, ural mountains (siberia and europe) |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| what is sliding boundaries? |
fault-lines cracks along which one plate slides past another
ex. sand andrewas fault: pacific plate is sliding past north american plate |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| what is diverging boundaries? |
when two plates move apart and create fracture zones.
ex. mid-atlantic ridge results from north american plate and eurasion plate seperating, south american plate and african plate seperating |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| name the kinds of plate boundaries |
diverging, sliding, convergent |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| first, large continent |
pangaea |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| 3 evidences of plate tectonics |
1. fossil remains of the mesasaurus are found on the south american continent and the african continent, but nowhere else
2. earthquakes and volcanoes do not occur randomly, but at plate boundaries
3. magnetic poles have been reversed 4 times because of movement of lithospheric plates. it is recorded in rock because spreading centers form new rock. |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| how does the plates of the lithosphere move around? |
as heated magma rises from the earth's core, convection currents move the plates of the lithosphere around |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| the upper layer of the mantle |
asthenosphere |
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chunsah Fri, 25 Apr 2008 01:15:20 GMT |
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| the study of the movements and the formation of the plates |
plate tectonics |
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chunsah Fri, 25 Apr 2008 01:15:19 GMT |
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| the earth's crust |
lithosphere |
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chunsah Fri, 25 Apr 2008 01:15:19 GMT |
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