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