These are clouds composed of water droplets and ranging in altitude from about 3 to 6 km (about 2 to 4 mi) above the earth. Two principal genera are included in the family. Altostratus clouds appear as a thick, gray or bluish veil, through which the sun or moon may be seen only diffusely, as through a frosted glass. Altocumulus clouds have the appearance of dense, fleecy balls or puffs somewhat larger than cirrocumulus. The sun or moon shining through altocumulus clouds may produce a corona, or colored ring, markedly smaller in diameter than a halo.
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Middle Clouds
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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...