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Definitions (156)
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comet
An object which circles the sun in a non-circular orbit. Commonly made up of a large mass of rock debris and ice. Basically, a giant snockball from space.
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connate water
Water included in the groundwater which is derrived from the rock itself, as opposed to water which has percolated down from the surface.
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sublimation
The direct change from the solid to the vapor phase (without passing through the liquid phase). Commonly occurs in ice and snow fields on sunny days above the snowline.
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aa
Hawaiian term used to describe a lava flow whose surface is broken into rough angular fragments. Aa flows commonly develop from pahoehoe flows as they cool and lose gas.
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absolute date
An estimate of the true age of a mineral or rock based on the rate of decay of radioactive minerals.
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acre-foot
The volume of water required to cover one acre of land to a depth of one (1) foot. One acre-foot is equal to 325,851 gallons of water.
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active volcano
A volcano that is erupting; or one that, while not erupting at the present, has erupted within (geologically) recent time and is considered likely to do so in the (geologically) near future.
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adiabatic rate
The rate of temperature change in the atmosphere due to the raising or lowering of an air mass. The "dry adiabatic rate" is 5.5 deg. F. per 1000 feet, while the "wet&quo [..]
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alluvium
A general term for clay, silt, sand, gravel or similar unconsolidated material deposited by a stream or other body of running water.
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aquifer
A water-bearing layer of rock or sediment capable of holding and transmitting fluid (such as water, gas, or oil).
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