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History Of Earth Crossword Puzzle

By: Emma Buckley
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Across
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Magma that hardens on the surface and forms igneous rock.
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Geologist use the ___ ___ ________ to determine the relative ages of sedimentary rock layers.
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A break in the Earths crust is a ____.
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A gap in the geological record.
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The ____ ____ of a rock is its age compared to the ages of other rocks.
Down
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A fossil that must be widely distributed and represent an organism that existed for a geologically short period of time.
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Elements release particles and energy in a process called ______.
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When magma cools and hardens into a mass of igneous rock below the surface.
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The ____ ____ of a rock is the number of years that have passed since the rock formed.
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The ____ of a radioactive element is the time it takes for half of the radioactive atoms to decay.