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Chapter 21 Crossword Puzzle

Cutler Wiggins

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Across
4.substance with pH above 7
6.What helps plants and other organisms grow?
7.pollution that enters water from a specific location and can be controlled or treated before it enters a body of water.
8.What is used to measure how acidic or basic something is?
10.When acidic moisture falls to Earth as rain or snow,it is called ______.
11.water that goes into drains and contains human waste,household detergents,and soaps
12.substance with a pH lower than 7
Down
1.________ consits of fine particles such as dust,pollen,mold,ash,and soot that are in the air air.
2.Farmers and home owners apply ______,which are substances used to keep insects and weeds from destroying crops and lawns.
3.pollution that enters water from a large area such as lawns,construction sites,roads ect.
5.a colorless,odorless gas found in car exhaust,and contributes to air pollution
7.The hazy,yellowish brown blanket of smog that is sometimes found over cities is called _________ because it forms with the help of sunlight.
9.What device lowers sulfur emissions from coal-burning power plants?

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