Summarizes information regarding the importance of water to biological systems, the total ecosystem and its interdependent parts. (CS)

Addressing the Seventh American Water Resources Conference, Washington, D. C., October, 1971, Anthony Wayne Smith, President, National Parks and Conservation Association, presents an expose on how rivers should be managed by methods which restores and preserve the natural life balances of the localities and regions through which they flow. The…

This article expresses one person's efforts and enjoyments in establishing and managing a small pond in New England. The original purpose of the pond was to attract birds. (MDR)

Population, depleted resources, pollution and other environmental issues are reviewed from an international perspective. The imperative nature of world-wide cooperation is emphasized for dealing effectively with ecological problems. Directions in which this cooperation should be effected are presented. (JP)

This is the sixth in a series of Conservation Yearbooks prepared by the U.S. Department of the Interior as environmental reports to the public concerning problems of water resources in the United States. Information presented includes descriptive information, statistical data, and extensive color photographs. The methods of presenting information…

Summarizes information about salt marshes, including descriptions of their development and structure, details of their values in terms of commercial fishing, stabilization of coastal zones, "reclamation" for grazing and cropfields, recreation and aesthetics. (CS)

Describes major desert aquatic habitats, including descriptions of environmental conditions characteristic of these areas and the adaptations of desert aquatic organisms to them. (CS)

This unit is intended to help students become aware of overall relationships and interactions that exist between the various segments of the environment. The unit consists of four topics: (1) Geology--The geological history of the earth as illustrated by fossils; (2) Plants and Animals--the role and interactions of plants and animals in the…

This report, a supplement to the third annual report of the National Science Board, "Environmental Science, Challenge for the Seventies," contains much of the information and interpretation that formed the basis for the conclusions and recommendations of the annual report. It assembles the views and judgments of leading environmental…

Summarizes what is known about two major variables involved in certain types of chemical pollution that seem to be changing the structure of the Earth's atmosphere. Discusses the greenhouse effect and the ozone layer. (TW)

This book, for grades 2-6, is designed to provide students with a highly motivating and unique opportunity to investigate an aquatic habitat. Students set up, observe, study, and reflect upon their own "desktop ponds." Accessible plants and small animals used in these activities include Elodea, Tubifex worms, snails, mosquito larvae, and fish.…

This interdisciplinary unit is intended for use in kindergarten classes. The unit follows the story line of the book, "Grandma's Beach Surprise," or any suitable children's story about the seashore environment. The unit deals with shelled animals found along the ocean shore. It includes the anatomy of various mollusks, their interaction with the…

Describes construction of a model ecosystem using a 10-gallon aquarium with a sand, water and air interface. Pesticides are placed on sorghum plants grown on the terrestrial portion. After 30 days, movement of the pesticide is traced using radioisotope techniques, from terrestrial to aquatic organisms. Details for calculating concentration factors…

This paper argues that a re-examination of current goals and methodologies and modifications to management practices are necessary if urban water crises are to be minimized. Three problem areas are focused on: (1) the projection of demand and the estimation of supply; (2) the alternatives for balancing demand and supply; and (3) the management of…

Presents generalizations regarding how running water systems change physically, chemically and biologically with stream order, i. e., from the tiny headwater streams (order 1) to those receiving first order headwater tributaries (order 2) and so on. Food chain diagrams respective of stream order are explained. Stream study projects are suggested.…