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16 Cards in this Set
- Front
- Back
distribution of volcanoes
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occur 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-ocean ridge forming new crustal material and plates move apart
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mid-ocean ridge
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worlds longest mountain chain, the rift valley 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-ocean 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 mantel
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subduction zones and volcanos
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subduction zones from magma then the magma comes out of the volcano
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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 Eastern united states across Central scotland and into scandinavia, 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 pattern of rock formation around mid-ocean ridges, reflected the reversal of magnetic north over millions of years; supported theory of plate tectonics
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glacial evidence
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rock striations indicated a single continental glacier stretching over africa, south american, & madagascar; support for idea of continental drift & 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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rocks
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naturally occurring objects usually made of 2 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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shows relief & surface structure of an area using contour lines
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a fair test
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a repeatable 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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