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Science Crossword

Student: Logan Esser
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Across
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The time it takes the half of life of an atom to decay
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To determine the age of sedimentary rock layers
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Its age compared to the age of other rocks
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A widely distributed fossil that geologists use to figure out the age of other rocks
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Lava that hardens on the surface and forms igneous rock
Down
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Is a break in the earths surface of crust
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The number of years that have passed since the formation of the rock
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Is a gap in geologic record
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Elements that release particles and energy in this process
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Magma cools and hardens to form a mass of igneous rock