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15 Cards in this Set
- Front
- Back
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cinder cone
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steep cone-shaped hill or mountian made of volcanic ash, cinders, and bombs piled up around a volcanos opening
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composite volcano
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tall cone shaped mountian where layers of lava alternate with layers of ash and other volcanic material
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index fossils
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fossiles of widely distributed organisms that lived during one short period
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shield volcano
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wide gently slpoing mountian made of laters of lava formed by quiet eruption
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unconformity
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place where old eroded rock is in contact with a newer rock layer
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epicenter
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point on earths surface right above an earthquakes focus
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focus
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point beneath earths surface where rock breaks under stress causing an earthquake
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p wave
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type of seismic wave that compresses and expands the ground
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s wave
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type of seismic wave that moves the ground up and down or side to side
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surface wave
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type of seismic wave that forms when p and s waves reach earths surface
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absolute age
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age of the rock given as the number of years since the rock formed
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era
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one of the three long units of geologic time between the precambrian and the present
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law of superposition
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geological principal that states that in horizontal layers of sedimentary rock each layer is older that the one above and younger than the one below it.
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pangaea
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the single ladmass the broke apart 225million years ago and gave rise to todays continents.
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radioactive decay
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breakdown of a radioactive element releasing particals and energy
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