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is the layer of gases that surrounds the planet. Earth's atmosphere is made of about 78% nitrogen, 21%oxygen, and other gases
harmful substances in the air, water, or soil. Air pollution is caused by pollutants in the air. Most air pollution is caused by the burning of fossil fuels such as coal, oil, and gasoline.
rain that contains more acid than normal and forms when nitrogen oxides and sulfur oxides combine with water in the air.
the combination of gases, mostly nitrogen and oxygen, that make up the atmosphere. Air has certain properties: mass, density, pressure
an instrument consisting of a glass tube open at the bottom and partially filled with mercury used to measure air pressure
an instrument that has an airtight metal chamber that expands and contracts depending upon the air pressure
lowest layer of the Earth's atmosphere, where most weather occurs, "tropo"means changing, 9-16 km thick.
second layer of the Earth's atmosphere, upper stratosphere has a layer of ozone, extends from top of troposphere to about 50 km.
third layer of the Earth's atmosphere, "meso" means middle, outermesosphere is the coldest part of the atmosphere, begins at 50 km and ends at 90 km.
upper most layer of the Earth's atmosphere, "thermo" means heat, dividedinto two layers- ionosphere and exosphere, air is very thin and very hot.
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