The Earth: Its Atmosphere

See description for color version FC0520., Uses animation and live-action photography to describe the earth's atmosphere and to picture the characteristics of the troposphere, stratosphere, and ionosphere. Cites the role of the atmosphere in causing changes in land and water masses. The composition of the atmosphere is listed and its characteristics at sea level, 20,000 feet, 10 miles, and 20 miles are described. Uneven heating and rotation are indicated as major causes of the two major wind systems, the easterlies and the westerlies. Discusses such weather instruments as the barometer, thermograph, anemometer, and radiosonde. Describes the influence of the sun on the earth's atmosphere in terms of sun spots and the aurora. Touches upon research being done to increase our understanding of the atmosphere and improve weather forecasting.