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Pycnocline- a layer in an ocean or other body of water in which water density increases rapidly with depth.

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Dissolved oxygen is important for organism because it is an essential material for the specie to be able to go through respiration. Dissolved oxygen is important for
a good water quality

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Total Dissolved Solids- a measure of the combined content of all inorganic and organic substances contained in a liquid in molecular, ionized or micro-granular (colloidal sol) suspended form

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Runoff- something that drains or flows off, as rain thatflows off from the land in streams

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Clearing land will transport materials into the stream that can effect organisms
2. cuts down on the wildlife around the stream which will decrease shade and increase temperature of water.

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Eutrophication- the process by which a body of water becomes enriched in dissolved nutrients (as phosphates) that stimulate the growth of aquatic plant life usually resulting in the depletion of dissolved oxygen

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0-2 mg/L: not enough oxygen to support life.
2-4 mg/L: only a few fish and aquatic insects can survive.
4-7 mg/L: good for many aquatic animals, low for cold water fish
7-11 mg/L: very good for most stream fish

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Oxygen is essential for aquatic life. The organism use oxygen for respiration.

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This can lead to a harmed water quality and organisms in the water will begin to die off

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is the amount of oxygen level dissolved in water