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15 Cards in this Set

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Nebular Hypothesis

the theory that the solar and stellar systems were developed from a primeval nebula.

Big Bang

the rapid expansion of matter from a state of extremely high density and temperature that according to current cosmological theories marked the origin of the universe.

Universe

all existing matter and space considered as a whole.

Galaxy

a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.

Hydrologic Cycle

a conceptual model that describes the storage and movement of water between the biosphere, atmosphere, lithosphere, and the hydrosphere.

Evaporation

The changing of a liquid into a gas, often under the influence of heat (as in the boiling of water).

Transpiration

the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere.

Precipitation

rain, snow, sleet, or hail that falls to the ground.

Runoff

the draining away of water (or substances carried in it) from the surface of an area of land, a building or structure, etc.

Groundwater

water held underground in the soil or in pores and crevices in rock.

Fossil

the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.

Body Fossil

A remnant or trace of an organism of a past geologic age, such as a skeleton or leaf imprint, embedded and preserved in the earth's crust.

Trace Fossil

a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.

Unaltered Fossil

This does not mean the organism is unchanged, but that the original material of the organism has not been changed to another substance.

Altered Fossil

has had the orginial material replaced by another substance.