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Vocabulary

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Term
Definition
Biome   a large region characterized by a specific type of climate and certain types of plant and animal communities  
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tundra   a treeless plain that is located in the Arctic or Antarctic and that is characterized by very low winter temperatures; short, cool summers; and vegetation that consists of grasses, lichens, and perennial herbs  
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permafrost   in arctic regions, the permanently frozen layer of soil or subsoil  
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tropical forest   a forest or jungle near the equator that is characterized by large amounts of rain and little variation in temperature and that contains the greatest known diversity of organisms on Earth  
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canopy   the layers of treetops that shade the forest floor  
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epiphyte   a plant that uses another plant for support, but not for nourishment  
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coniferous tree   a tree belonging to a group of tree species that bear their seeds in cones and tend to be evergreen  
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deciduous tree   describes trees that lose their leaves at the end of the growing season  
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temperate deciduous tree   a forest (or biome) that is characterized by trees that shed their leaves in the fall  
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taiga   a region of evergreen, coniferous forest below the arctic and subarctic tundra regions  
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temperate grassland   a community (or biome) that is dominated by grasses, has few trees, and is characterized by cold winters and rainfall that is intermediate between that of a forest and a desert  
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savanna   a plain full of grasses and scattered trees and shrubs; found in tropical and subtropical habitats and mainly in regions with a dry climate, such as East Africa  
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chaparral   a type of vegetation that includes broad-leafed evergreen shrubs and that is located in areas with hot, dry summers and mild, wet winters  
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desert   a region that has little or no vegetation, long periods without rain, and extreme temperatures; usually found in warm climates  
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aphotic zone   the deeper parts of the ocean, where there is so little light that plants cannot carry out photosynthesis  
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photic zone   the area of an aquatic system that receives enough light for photosynthesis to occur  
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intertidal zone   an area along ocean shorelines that lies between low and high water lines  
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neritic zone   a shallow marine environment that is near the shore or over the continental shelf and that is rich in minerals and nutrients produced by biotic activity  
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oceanic zone   the region of the open sea that has characteristic life-forms and geography  
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pelagic zone   the region of an ocean or body of fresh water above the benthic zone  
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benthic zone   the bottom region of oceans and bodies of fresh water  
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plankton   the mass of mostly microscopic organisms that float or drift freely in the waters of aquatic (freshwater and marine) environments  
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estuary   an area where fresh water from rivers mixes with salt water from the ocean; the part of a river where the tides meet the river current  
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eutrophic lake   describes a lake or other body of water that contains a rich supply of plant nutrients  
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oligotrophic lake   a lake that lacks plant nutrients and that has a lot of oxygen dissolved in its lower layer  
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freshwater wetland   an area of land that is covered in fresh water for at least part of each year  
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