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The envelope of gas that surrounds Earth.
atmosphere
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Elevation above sea level.
Altitude
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Rain that contains more acid than normal.
Acid Rain
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An instrument used to measure changes in air pressure.
barometer
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The amount of mass of a substance in a given volume.
Density
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A form of oxygen that has three oxygen atoms in each molecule instead of the usual two.
ozone
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A brownish haze that is a mixture of ozone and other chemicals, formed when pollutants react with each other in the presence of sunlight.
photochemical smog
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Harmful substances in air, water, or soil.
pollutants
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The amount of force pushing on an area.
pressure
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A black powdery or flaky substance consisting largely of amorphous carbon, produced by the incomplete burning of organic matter.
soot
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Water in the form of gas.
Water vapor
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The condition of Earth's atmosphere at a particular time and place.
water vapor
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Earth's atmosphere is 78% nitrogen, 21% Oxygen and the last 1% is a mixture of carbon dioxide, water vapor, and many other gases as well as particles of liquids and solids.
Earth's atmosphere
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Air pressure decreases as altitude ________________.
Increases
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As air pressure decreases so does ____________.
density
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Air pressure is measured with a barometer. Name the two kinds.
- Mercury barometer - where air pushes down on on the mercury pushing it further up a small tube causing the pressure to rise.
- Aneroid barometer - as air pressure increases the thin walls of the chamber are pushed in making the pressure rise.
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How many layers of atmosphere are there on Earth?
4
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The layer of atmosphere closest to the earth where it rains, snows, storms...most clouds are in this layer. For every km you ascend the temp. drops a degree. It can get as cold as -60 deg. C.
Troposphere
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The ozone layer absorbs ultraviolet radiation in this layer that is 12 - 50 km above the earth. Temps start at -60 Deg C and get higher as you go up.
Stratosphere
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Most meteoroids burn up in this layer producing meteor trails. Temperatures approach -90 deg. C but gets warmer as it gets higher.
Meso (or middle) sphere
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The outermost layer of Earth's atmosphere. The air here is thin and very hot - up to 1,800 deg. C
It has 2 layers the ionosphere 80 - 400 km and the exosphere above 400 km.
Thermosphere
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Thermo means ___________
heat
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What unit of measurement is used to measure air pressure?
millibars
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