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D - Science - Unit 6
Unit 6 Vocab - Part 1
Term | Definition |
---|---|
weather | the condition of earth's atmosphere at a particular time and place |
atmosphere | the envelope of gases that surround the planet |
ozone | a form of oxygen that has 3 oxygen atoms in each molecule instead of the usual 2 |
water vapor | water in the form of a gas |
pollutant | harmful substances in the air, water or soil |
photochemical smog | the brown haze that develops in sunny cities |
acid rain | rain that contains more acid than normal |
troposphere | the inner, or lowest, layer of atmosphere in which earth's weather occurs |
stratosphere | the second layer of the atmosphere that contains the ozone layer |
mesosphere | the middle layer of the atmosphere that protects earth's surface from being hit by most meteoroids |
thermosphere | the outermost layer of earth's atmosphere |
ionosphere | the lower layer of the thermosphere |
exosphere | the outer portion of the thermosphere |
tropo- | turning or changing |
meso- | middle |
exo- | outer |
thermo- | heat |
air pressure | gravities push on the layers of air down on the Earth's surface |
atom | the smallest unit of a chemical element that can exist by itself |