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earth science ch 1

QuestionAnswer
eon longest division of time
era middle division of time
period shortest division of time
relative age using info to sequence events in chronological order
half-life amount of time needed for an element to decrease by 50%
dendrochronology using tree rings to decode earth's past climate
superposition layer at bottom=oldest layer at top=youngest
original horizontality assume rocks form horizontally and then are shifted later
cross-cutting relationships if layers of rock are cut by a fault/lava, then the fault/lava is younger than the rock itself
inclusions when pieces of rock are within a layer, then the inclusions are older than the rock
radioactive decay parent element transforms into a new daughter element over a time period
longer half-life older element
shorter half life more recent element
equation for half-life age=HLx(#of half lives passed)
Created by: gschultz2028
 

 



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