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Earth History

Use your brain and your science books (if you need 'em) to complete the crossword puzzle
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Across
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This is used to date objects 50,000 years old or less
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A layer of rock
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The Law of ______ states if pieces of rock are inside another layer, those pieces are older
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This would be used to figure out the absolute age of a dinosaur fossil
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The Law of _______ states in any undisturbed sequence of strata, the oldest layers are at the bottom
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When humans choose what organisms die or survive
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Remains of an organism used to determine the age of the rock layer it is found in
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The ______ layers are on the top
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The ________ layers are on the bottom
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Type of rock formed by heat and pressure
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Arranging rock layers in order from oldest to youngest
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Change over time
Down
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This mass extinction wiped out the dinosaurs.
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When nature chooses what organisms die or survive
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The Law of _____ ______ states anything that cuts through rock is younger than the rock is cuts
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Type of rock where fossils are found
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When a large percentage of Earth's species cease to exist in a relatively short period of time
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The scientist who came up with the Theory of Evolution
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The amount of time it takes for half of a radioactive material to decay
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Type of rock formed when magma or lava cools