Difference between relative and radiometric dating of fossils

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astrobleme - A circular erosional feature that has been ascribed to the impact of a meteorite or comet.atmosphere (unit) - A unit of pressure equal to 101,325 newtons per square meter, or about 14.7 pounds per square inch.arroyo - A steep-sided and flat-bottomed gully in an arid region that is occupied by a stream only intermittently, after rains.

bank - The land alongside or sloping down to a river or lake.barrier island - A long, narrow island parallel to the shore, composed of sand and built by wave action.basalt - A fine-grained, dark, mafic igneous rock (~50% Si O) composed largely of plagioclase feldspar and pyroxene; rough volcanic equivalent of gabbro.alkaline - Term pertaining to a highly basic, as opposed to acidic, substance.For example, hydroxide or carbonate of sodium or potassium.

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