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science
Ch. 5 vocab
| Question | Answer |
|---|---|
| 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. |
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gwcs grade 5
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