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science

Ch. 5 vocab

QuestionAnswer
air - the mixture of gases that make up Earth’s atmosphere
altitude - a measure of the distance an object is above sea level; usually the object is airborne.
atmospheric pressure - a measure of the force per unit area of air molecules in the atmosphere at a given altitude
barometer - an instrument that measures atmospheric pressure
troposphere - a layer of atmosphere that occurs from 0 to about 11 kilometers above Earth’s surface; where all weather occurs.
stratosphere - a layer of atmosphere that occurs from about 11 kilometers to 50 kilometers above Earth’s surface; the location of the ozone layer.
mesosphere - a layer of atmosphere that occurs from about 50 kilometers to 80 kilometers above Earth’s surface; the coldest layer.
thermosphere - a layer of atmosphere that occurs from about 80 kilometers to about 500 kilometers; this layer has a low density of air molecules and a very high temperature.
exosphere - the region of the atmosphere that begins at about 500 kilometers above Earth and extends into space; the location of the orbits of satellites (see next page).
ionosphere - portions of the atmosphere in the region of the thermosphere where electricity can be transmitted (see next page).
specific heat - the amount of energy needed to raise the temperature of 1 gram of a substance by 1 degree Celsius.
rotation - the motion of Earth spinning on its axis; one rotation is called a day.
revolution - the motion of Earth moving around the Sun; one revolution is called a year.
Created by: gwcs grade 5
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