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Crossword Word Search Worksheet
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EARTH HISTORY

NAME __________________________________

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