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8 Cards in this Set
- Front
- Back
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Sapwood
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The younger wood just inside the bark where most of the tree’s nutrients are transported
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Pollutants
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A substance introduced into the air, water, soil or food, in concentrations that threaten the health of survival of organisms; can affect natural population growth by destroying habitat and food sources of by killing organisms; can be natural or a result of human technology
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Acid Precipitation
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Results from air-borne pollutants , particularly sulfur dioxide, and nitrogen monoxide, reacting with water vapour in the atmosphere to form acidic compounds their return to Earth in precipitation
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pH Scale
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A scale developed by chemists for measuring acidity of solutions
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Bioaccumulation
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The buildup of a substance within the tissues of organisms over time
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Biomagnification
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The increase in concentration of a substance within the tissues of organisms that are at higher levels of the food chain
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Pesticides
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A chemical substance used to control organisms humans consider to be pest
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DDT
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A synthetic pesticide that was widely used to control incest pests in the 1970s, when it was discovered to have harmful effects on organisms
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