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14 Cards in this Set
- Front
- Back
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volcano
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magma and gas come though it
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vent
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an opening at the surface of the Earth through which volcanic material passes
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Magma Chamber
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the body of molten rock that feeds a volcano
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Which of the following factors influence whether a volcano erupts explosively?
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the concentration of water in the magma
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what lava and pyroclastic material classified? Describe four types of lava?
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Aa: lava pours out quickly and forms a brittle crust. the crust is torn into jagged pieces as molten lava continues to flow underneath
Pahoehoe: lava flows slowly, like wax dripping from a candle. Its glassy surface has rounded wrinkles. Pillow lava: forms when lava erupts underwater. As you can see here, this lava forms rounded lumps that are the shape of the pillow blocky lava: is cool, stiff lava that does not travel far from the erupting vent. blocky lava usually oozes from a volcano and forms jumbled heaps of sharp-edged chunks |
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Explain how the presence of silica and water in magma increases the chances of an explosive eruption
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the magma is high so a explosive eruption eruption is more likely
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How us an explosive eruption similar to opening a can of soda that has been shaken?
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stuff goes in the air make a mess
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I predict the silica content of aa, pillow lava, Pahoeho and blocky lava
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help
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The part of the Earth that is molten is the
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outer core
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The part of the Earth on which the tectonic plates move is the
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asthenosphere
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Identify the layers of the earth
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crust, mantle, inner core, outer core
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At mid-ocean ridges
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Sea-floor spreading occurs
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Why do you think old are rare on the ocean floor?
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There are new rocks aways forming on top of the old rock.
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Plate tectonics
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The theory that explains how large pieces of the Earth's outermost layer, called tectonic plates, move and change shape
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