Describes the origin of limestone caverns, using Mammoth Cave as an example, with particular reference to the importance of groundwater information of caverns, the present condition of groundwater, and how caverns develop within fluctuating groundwater zones. (BR)

Discusses characteristics of sand, its derivation, various colors, shape, grain size, how it is transported, how sand dunes are formed, and economic uses. (BR)

Discusses U.S. National Parks as natural laboratories for the study of ecology, geology, earth science, and botany. Suggests activities which will enable children to more fully appreciate the great age of the earth, its history, the complexity of its structure and composition, and the myriad plants and animals which inhabit it. (BR)

Discusses the atmosphere, the lithosphere, and the hydrosphere and how each of these affects the life of man and how man affects them. Of particular concern is the effect of each upon the weather. The author concludes that there is infinite variety in the earth's scenery, yet there is unit within this diversity; there is constant change; and there…

Describes purpose and use of elementary school earth science field instruction sites. Scientific concept and methodology objectives are given. General principles for earth science site model selection and implementation are discussed. Operationof site model program in New York City is explained. (JM)