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science

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Across
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He 2
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fossils that are used to define and identify geologic time periods
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a fossil in which minerals replace all or part of an organism
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formed when an object is placed into soft mud and is removed by decomposition or physical sources
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The movement of deep, cold, and nutrient-rich water to the surface
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a plant , animal or other organism is perfectly preserved for many of years
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Microscopic organisms that float and drift in the ocean waters are called
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A fossil formed when most of the materials making up an organism break down, leaving only carbon
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rock that forms when melted rock cools and hardens
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The breaking down of rocks and other materials on the Earth's surface.
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A thin layer of gases surrounding Earth
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a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.
Down
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Preserved remains of once-living organisms
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A type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reactions.
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photosynthetic algae found near the surface of the ocean
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WATER
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Li 3
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Molten rock beneath the earth's surface