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| semi-molten layer that crustal plates move over |
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| rock family that is NOT crystalline |
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| when limestone is metamorphised by HEAT & PRESSURE what results? |
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| techniques of determining rock polarity |
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| why can't rocks over 3.5 bill yrs be found? |
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| Mid-Atlantic Ridge; volcanoes |
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Definition
| Where are the youngest rocks formed? |
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| where magma is HIGH in silicates, are volcanoes composite or shield? |
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| which crustal collision results in the most active mountain building? |
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| Volcanic emissions & hazards |
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Definition
| ash falling, acid rain, lava flow, gases |
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| evidence of plate tectonics |
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Definition
| plate boundaries, seafloor spreading, paleomagnetism, convection & plate tectonics |
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| evidence of plate tectonics |
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Definition
| plate boundaries, seafloor spreading, paleomagnetism, convection & plate tectonics |
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Definition
| midocean ridges are formed by currents of magma rising up from mantle; volcanic eruptions create new basaltic ocean floor, then spreads away laterally from the ridge |
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| older lithosphere descends into asthenosphere where it is ultimately recycled; amount of new seafloor created is compensated for by the amount lost @ subduction zones - earthquakes take place as margin of subducting plate |
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| spreading; usually midocean ridges |
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| 2 plates slip past 1 another laterally |
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| along plate boundaries that many volcanoes and earthquakes take place |
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| deformation of earth's crust |
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