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16 Cards in this Set
- Front
- Back
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distribution of volcanoes
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occur at hot spots or convergent boundaries forming 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 crustal material and plates move apart
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mid-ocean ridge
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world's 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 in 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 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; support theory of plate tectonics
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glacial evidence
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rock striations indicated a single continental glacier striating over Africa, South America and Madagascar, support for the 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 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, 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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shows relief of and surface features of an area using contour lines
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fair test
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a repeatable procedure for manipulating only one variable in order to ansew and question
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floater
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an object or material which less dense than the substance it is in,usually molten or a liquid
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construction of a data table
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kacey
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