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8 Cards in this Set
- Front
- Back
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Theory of Plate Tectonics
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earth's crust float on a layer of semiliquid rock or magma (molten rock).
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Causes of Volcanoes
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*Crack in the earth's crust allows for magma and gases to surface:1. magma chambers-deep pockets of molten rock.2.hot magma rises and pushes through the earth's crust. 3. when magma breaks through it is called lava. 4. lava comes out through vents (may have more than 1 vent)
*minerals and gases determine how much the volcano will explode *some volcanoes produce clouds filled with jagged bits of crushed rocks-ash *crater-bowl shape at top of main vent of a volcano |
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locations of volcanoes
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*2/3 of active volcanoes are found in an area of the Pacific Ocean called the Ring of Fire
*Mediterranean Sea *More eruptions occur UNDER the ocean than on land *HOT SPOTS-pools of intensely hot magma |
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classifying volcanoes
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*cinder cone shape-more like a hill, bowl like crater, 1 vent, showers bits of ash and lava
*shield volcano-gradually sloping sides, look like upside down saucers, generally largest in the world, but not usually explosive *composite cone-steep sides and very tall, explosive eruptions *active-one that has erupted at some point during a recorded time and is expected to erupt again *dormant-have erupted in distant past, currently inactive, not expected to erupt again *extinct-does not have a recorded eruption and not expected to erupt in the future |
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effects and products of volcanoes
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*vog-volcanic fog a pollution can aggravate respiratory problems
*acid rain from gases *debris flow-falling mud and rocks *pumice, obsidian jewelry, granite for bldg |
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other thermal eruptions
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*hot spring-heat from magma warms water, water rises to earth's surface
*geyser-hot spring that periodically blows steam and hot water into the air *mud pot-hot spring that contains more mud than water |
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be able to draw 3 kinds of faults and label them
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draw and label faults
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be able to label the p arts of a volcano:
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side vent, magma chamber, lava, vent, crater
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