Answer:
because harmful substances often chemicals or microorganisms contaminate a stream, river, lake, ocean, aquifer, or other body of water, degrading water quality and rendering it toxic to humans or the environment.
Explanation:
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was a period of rapid colonization of the African continent by European powers. But it wouldn't have happened except for the particular economic, social, and military evolution Europe was going through.
A settled area with just one place to buy food is called a village.
Correct answer: A
This small settlement is a group of houses, together with other buildings such as a church and a school, in a country area and is usually found in a rural setting. Most villages have central point, which is the church or the marketplace.
South is downstream
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The correct answer is:
C) NAFTA encourages trade between Mexico, U.S. and Canada.
Explanation:
The North American Free Trade Agreement or NAFTA was an agreement signed between Canada, the USA and Mexico on January 1, 1994 establishing a trade bloc between the three.