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6
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Method useed to determine the absolute age of a rock by measuring the amounts of parent and daughter materials in a rock
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7
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A type of rock that has been profoundly changed by heat and/or pressure into another kind of rock
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8
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An organism with a 3-lobed exoskeleton; considered an index fossil
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9
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The principle that Earth processes today are similar to those that ccurred in the past
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10
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The divisions of earth's geologic time based on the life forms that lived only during certain periods
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11
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To determine the age, in years, of rocks by studying the properties of atoms in rocks
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12
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Breaking down of isotopes
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13
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Type of rock formed when layers of sediment are pressed and cemented together
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15
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A process by which organisms with characteristics better suited to a certain enviornment have a better chance of surviving and reproducing than organisms that do have these characteristics
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18
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Fractures in contunity of a rock formation
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19
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Remains, imprints, or traces of prehistoric organisms
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20
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Samples of ice taken from glaciers that provide evidence of past atmospheric condtions
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