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PSSA Vocab Unit 3

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Term
Definition
Acid deposition   Precipitation with a pH less than 5.6 that forms in the atmosphere when certain pollutants mix with water vapor.  
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Stream order   Energy and nutrient flow that increases as water moves toward the oceans (e.g., the smallest stream (primary) that ends when rivers flow into oceans)  
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Topographic map   Representation of a region on a sufficient scale to show detail, man-made and natural features of a portion of the land including certain physical & cultural features; the portrayal of the position, relation, size, shape and elevation of the area  
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Watershed   The land area from which surface runoff drains into a stream, channel, lake, reservoir or other body of water; also called a drainage basin.  
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Wetlands   Lands where water saturation is the dominant factor determining the nature of the soil development and the plant and animal communities (e.g., sloughs, estuaries, marshes).  
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Hydrology   The scientific study of the properties, distribution and effects of water on the earth’s surface, in the soil and underlying rocks and in the atmosphere.  
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Groundwater   Water that infiltrates the soil and is located in underground reservoirs called aquifers.  
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Mitigation   The policy of constructing or creating man-made habitats, such as wetlands, to replace those lost to development.  
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Lentic   Relating to or living in still water.  
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Lotic   Relating to or living in actively moving water.  
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