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1
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isotope after releasing radioactive energy
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2
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one of its isotopes is used in the dating of organic material
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3
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a section or rock that appears above the surface of surrounding land
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4
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time it takes for half a radioactive sample to decay
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5
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theory that Earth's history spans billions of years
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6
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type of dating that allows determination of number of years since an event occured
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7
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rock formed from recrystallization of magma
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8
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rock that forms when magma invades preexisting rock
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9
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theory that geological processes have always fundamentally been the same
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11
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disintegration of an unstable atom, releasing radiation
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12
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state of the inner core
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13
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type of dating that allows layers of rock to be placed in chronological order
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14
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type of element defined by its atomic mass
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18
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type of fossil that provides information on relative age of rock layer
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19
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state of the outer core
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21
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isotope prior to releasing radioactive energy
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22
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plastic layer of the Earth
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23
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inner most layer of the mantle
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24
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a layer of sedimentary rock
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25
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method of energy transfer that causes the mantle to crack, tear and move the Earth's crust
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27
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a substance having properties of a solid that flows under pressure
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28
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rock formed from erosion and deposition of preexisting rock or organic material
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