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A Marine boot camp instructor recorded the time in which each of 15 recruits completed an obstacle course both before and after basic training.To test whether any improvement occurred,the instructor would use a t-distribution with 15 degrees of freedom.
Salt Dome
A geological formation created when layers of salt are pushed upward by the weight of overlying rock, sometimes trapping oil and gas.
Fault Zone
A region of numerous, closely spaced faults where the Earth's crust has fractured and moved.
Unconformity
A gap in the geological record where rock layers have been eroded or never deposited, representing a period of non-deposition or erosion.
Energy Resource
Any natural or artificial substance or phenomenon that can be utilized to produce power, such as fossil fuels, solar, wind, or hydro power.
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