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Rock History Crossword Puzzle

Chapter 4 L2 and L3 vocab
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Across
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The geological principle that states that in a horizontal rock, each layer is older than the layer above
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Wildly distributed organisms that lived a long time ago
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Igneous rock that forms when magma hardens
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Absolute age tells scientists the number of years ago a rock layer formed.
Down
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Radioactive parts break down releasing fast particles
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The geologic age of a fossil organism, rock, or geologic feature or event defined relative to other organisms, rocks, or features or events rather than in terms of years.
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A gap in the geological record that shows were rock layers are
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relating to or denoting rock that has been extruded at the earth's surface as lava or other volcanic deposits.
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the time taken for the radioactivity of a specified isotope to fall to half its original value.
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(of a rock formation) be broken by a fault or faults.