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Chapter 15
Key Terms
9
Science
8th Grade
11/10/2006

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Term
Weather
Definition
The condition of Earth's atmosphere at a particular time and place.
Term
atmosphere
Definition
The layer of gases that surrounds the planet.
Term
Ozone
Definition
A form of oxygen that has 3 oxygen atoms ineach molecule instead of the usual 2
Term
Water Vapor
Definition
Water in the form of gas.
Term
pollutants
Definition
Harmful substances in the air, water, or soil.
Term
Photochemical Smog
Definition
The brown haze that forms over cities.
Term
Temperature Inversion
Definition
A layer of warm air prevents the rising air from escaping.
Term
Acid Rain
Definition
Rain that contains more acid than usual.
Term
pressure
Definition
The force pushing on an area or surface.
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