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15 Cards in this Set
- Front
- Back
distribution of volcanos
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occurs at hot spots or convergent boundaries forming volcanic mountains or volcanic island arcs "ring of fire"
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sea floor spreading
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magma rises at the mid-oceanic ridge, forming new crystal material and plates move apart.
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mid-ocean ridge
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world's longest mountain chain running down the center of the ridge is the site of new plate growth.
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thickness of the sediments on the ocean floor
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as you go from the mid-oceanic ridge the sediments get thicker and older
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subduction zones
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a denser oceanic plate goes under either a continental plate or another less dense oceanic plate to move into the mantle
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trench
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surface feature of a subduction zone, deepest parts of the ocean
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ancient mountain chain
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Running from NE South America to NW Africa to Easter United states across Central Scotland, this chain was considered evidence for continental drift and later plate tectonics.
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magnetic reversals
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used to show patter of rock formation around mid-ocean ridges, reflected the reversal of of magnetic north over millions of years.
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glacial evidence
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rock striations indicated a single continental glacier streching over Africa, South America and Madagascar, support for idea of continental drift and theory of plate tectonics.
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role of sample size in density
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the amount of sample size does not affect density because it is calculated to be mass per 1 unit of volume.
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rock
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naturally occurring, usually made of two or more minerals
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minerals
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crystalline structure, solid naturally occurring, definite chemical makeup
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topographic map
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show relief of an area and surface features of an area using contour lines.
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fair test
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a repeating procedure for manipulating only one variable in order to answer a question
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floater
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an object or material which is less dense than the substance it is in, usually molten or a liquid.
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