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History Of Earth Crossword

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Across
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What is a result in deformation due to plate tectonics?
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What is a break in Earth's crust named?
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What material helped determine Earth's approximate age?
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A type of rock formed by other remains of other rocks,plants, and animals?
Down
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What is the time it takes for half of the radioactive atoms to decay called?
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What are preserved traces of living things?
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What type of fossils are widely distributed during a short geological period of time?
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What is a type of change that results in the formation of chemical substances?
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What is it called when magma cools on the inside of igneous rock?
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What is the Earth partly made up of?