17 why are dams used they are obstructions places in

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17) Why are dams used? They are obstructions places in bodies of water to block its flow. Used to prevent floods, provide drinking water, allow irrigation and generate electricity. 18) How can you conserve water? Install low-flow faucets, showerheads, washing machines and toilets. Capture rain runoff from roofs. Using the Xeriscaping by replacing exotic plants with native plants to adapt to local perception patterns. Recycle wastewater for irrigation and industrial uses. Fix leaky popes. Audit industries. 19) What kind of pollution is found in groundwater? Surface water? Leaking of underground storage tanks, improperly designed wells, and improper storage of hazardous waste all contributes to the pollution of groundwater. As for surface water 20) What is the difference between point and nonpoint sources of pollution? Point sources are where large quantities of pollutants are discharged. (Ex. Power plant) And Nonpoint sources are
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more diffused, consisting of many small widely spread sources. (Ex. Cars) 21) What are the steps for treating waste water? Filtering through septic systems. These tanks spate solids and oils from water. Microbes decompose pollutants in the water. Also, sewer systems that remove solids and treat water with chlorine. 22) What are some problems with industrial fishing? Destroys complex ocean communities (ex. reefs). Long line fishing kills turtles, sharks and seabirds. By catching often captures non target animals resulting in millions of deaths each year. Overfishing has caused many fisheries to collapse, destroying fishing economies. 23) Describe the surface water in different types of global current systems. 24) What is the difference between a metal, ore and alloy? Ore- A mineral occurring in sufficient quantity and containing enough metal to permit its recovery and extraction at a profit. ... Metal- An alloy of two or more metallic elements. Therefore, Rocks have minerals, which in large concentration are called ores and these are mined for metals!
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25) What are the different types of mining and what is commonly extracted from each type? Mining techniques can be divided into two common excavation types: surface mining and sub-surface (underground) mining. Today, surface mining is much more common, and produces, for example, 85% of minerals (excluding petroleum and natural gas) in the United States, including 98% of metallic ores. 26) What are the earth’s layers? 1. Lithosphere. 2. Asthenosphere.
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