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the presence in or introduction  into the environment of a substance or thing that has harmful or poisons effects.

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is a measure of the hydrogen ion concentration of a solution

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is the degree or heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.

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is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the to the naked eye,similar to smoke in air.

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is the amount of gaseous oxygen 02 dissolved in the water.

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is land consisting of marshes or swamps;saturated land.

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is the tidal mouth of large river, where the tide meets the stream

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is a very large expanse of sea,in particular , each of the main areas into which the sea is divided geographically.

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a river or stream flowing into a larger river or lake.

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the land that water flow across or under on its way to a river.