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EARTH HISTORY

NAME __________________________________

PERIOD __________________
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Across
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A scientist that studies Earth
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A naturally occurring warm body of water heated from underground
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A subdivision of a geological period
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A deposit of calcium carbonate resembling an icicle hanging from the roof of a cave
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Rock that forms when molten rock hardens
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The fluid portion of the mantle that has special properties
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A mix of humus, sand, silt, clay, gravel and/or pebbles
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Bits of dead plant and animals parts in soil
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The study of fossils
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The rigid outer layer of Earth
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This type of rock covers about 75% of the earth's surface.
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A theory that says geological processes observed in the past are the same as those observed today
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Limestone mainly composed of the skeletons of marine organisms
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A broad span of geological time based on the general type of life existing in that time
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A sedimentary rock made up of sand particles stuck together
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An era when mammals exist; meaning "recent animal life
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The smallest particle of an element
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Molten rock under the surface
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A substance formed from carbon and oxygen
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A layer in a soil profile
Down
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A sedimentary rock made up of clay or silt
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The largest division of geological time
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A scientist who studies soil
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A calcium carbonate deposit shaped like an upside down icicle formed on the floor of the cave
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A theory that says Earth's outer layers are made up of moving parts
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Thin layers of rock that lie at different angles
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Principal of ________ is a theory that says sedimentary rocks on the bottom are older than rocks on the top
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The study of the order and correlations of Earth's rocks
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An era when dinosaurs existed; means middle life
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A fossil that characterizes a particular period of time
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Rock that has changed from another rock because of heat pressure, or a chemical reaction
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Any remains, trace, or imprint of animal or plant life preserved in Earth's crust
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A carbonate mineral with the chemical formula CaCO3
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A person who explores caves
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An era when trilobites, corals, brachiopods, early fish, and early amphibians existed; means "ancient animal life
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An opening in Earth's crust where lava, cinders, ash, and gases come to the surface
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A span of time within an era
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Molten rock on the surface of the Earth