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15 Cards in this Set

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Abrasion
the physical action of scraping, rubbing, grading, or wearing away of rock surfaces and sediments due to the movement of solid sediments in an erosional system such as a stream or wind
Absolute Age
the actual age, or date, in years when a geological event occured or a rock was formed
Absolute humidity
the amout (mass) of water vapor in a unit volume of air, such as in grams/cubic meter
Absolute Zero
theoretically, the lowest possible temperature; no heat energy can be extracted at this temperature
Absorbed
taken into a material
Aerosol
Small solid or liquid particles suspended in a gas; suspended solid or liquid water are the aerosols that compose fog and clouds
Air mass
a large body of air in the troposphere with similar characteristics of pressure, moisture, and temperature
Altitude
(1) the vertical distance (elevation) between a point and sea level or Earth's surface (2) the angle of a celestial object above the horizon; usually expressed in degrees
Anemometer
a weather instrument used to measure wind speed
Angle of incidence
the angle at which the sun's rays hit Earth's surface; also called the angle of insolation
Anticyclone
a high pressure mass of air within the trosophere in which air moves out from the center; rotating clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere; also called a high
Aphelion
the point in a planet's orbit when it is farthest from the sun
Apparent Diameter
the diameter a celestial object appears to have, depending on its distance from an observer, not the actual diameter
Apparent motion
a motion of an object that is not real but appears to be real, such as the daily motion of the stars in the sky caused by the real motion of Earth's rotation
Apparent solar day
a day of varying length determined by the time it takes for the sun to arrive at its highest point in the sky on two consecutive days at the same location, often measured by a sundial