Stratosphere, upper layer of the atmosphere commencing at an altitude of 8 to 16 km (5 to 10 mi) and extending upward to about 50 km (30 mi). In the lower portion of the stratosphere, the temperature remains nearly constant with height, but in the upper portion the temperature increases rapidly with height because of absorption of sunlight by ozone. The stratosphere is almost completely free of clouds or other forms of weather.
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Pollution exists in many forms and affects many different aspects of Earth’s environment. Point-source pollution comes from specific, locali...
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Air Pollution, addition of harmful substances to the atmosphere resulting in damage to the environment, human health, and quality of life. O...
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Soil is a mixture of mineral, plant, and animal materials that forms during a long process that may take thousands of years. It is necessary...
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Water Pollution, contamination of streams, lakes, underground water, bays, or oceans by substances harmful to living things. Water is necess...
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Solid wastes are unwanted solid materials such as garbage, paper, plastics and other synthetic materials, metals, and wood. Billions of tons...