| Resource that can be replenished rapidly (hours to several decades) through natural processes. |
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| Particular chemical or form of energy that can adversely affect the health, survival, or activities of humans or other living organisms. |
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| Numeric value that indicates the relative acidity of a substance on a scale of 0-14, with the neutral point at 7. |
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| Innermost layer of the atmosphere |
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| Organism that feeds only on primary consumers. |
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| Group of individual organisms of the same species living in a particular area. |
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| Heat buildup in the troposphere because of the presence of certain gases, called greenhouse gases. |
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| Study of the interactions of living organisms with one another and with their nonliving environment of matter and energy |
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| Populations of all species living and interacting in an area at a particular time. |
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| An increase in the concentration of a chemical in specific organs or tissues at a level higher than would normally be expected. |
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| Increase in concentration of DDT, PCBs, and other slowly degradable, fat-soluble chemicals in organisms at successively higher trophic levels of a food chain or web. |
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| Swamps found on the coastlines in warm tropical climates. (Mrs. MusGROVE) |
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| Partially enclosed coastal area at the mouth of a river where its fresh water, carrying fertile silt and runoff from the land, mixes with salty seawater. |
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| Conversion of atmospheric nitrogen gas into forms useful to plants by lightning, bacteria, and cyanobacteria |
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| What is the Earth's population? |
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| Gradual shift from small, mobile hunting and gathering bands to settled agricultural communities in which people survived by learning how to breed and raise wild animals and cultiv |
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| Physical, chemical, and biological changes that take place after a lake, estuary, or slow-flowing stream receives inputs of plant nutrients-mostly nitrates and phosphates-from natu |
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| Annual number of live births per 1,000 people in the population of a geographic area at the midpoint of a given year |
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| Catching fish in huge nets that drift in the water |
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| Products of partial or complete decomposition of plants and animals that occur as crude oil, natural gas, or heavy oils as a result of exposure to heat and pressure in the earth's |
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| Annual market value of all goods and services produced by all firms and organizations, foreign and domestic, operating within a country |
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| Outer shell of the earth, composed of the crust and the rigid, outermost part of the mantle outside the asthenosphere |
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| Complex mixture of air pollutants produced in the lower atmosphere by the reaction of hydrocarbons and nitrogen oxides under the influence of sunlight |
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| Land area that delivers water, sediment, and dissolved substances via small streams to a major stream (river) |
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| Movement of nutrient rich bottom water to the ocean's surface. This can occur far from shore but usually occurs along certain steep coastal areas where the surface layer of ocean w |
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Digits of Pi
Multiplication Table
Minute Math (Addition)
