Traces the history of life on earth from the Cambrian period to present. Stresses the importance of inter-dependence of individual and species and the dependence of life upon non-life. Discusses the speed at which man has altered nature's balance and the question of how an ecological balance is to be maintained. (LK)

Summarizes data from questionnaires sent to 1,240 junior colleges requesting information about their earth-science courses and earth-science instructors. (PR)

Short articles describe the demonstration of Brownian motion in a bubble included in a quartz crystal, an inexpensive technique for investigating conservation of momentum, a method of teaching vector addition, and ideas for inexpensive substitutes for heavy masses and for additional laboratory bench space. (AL)

Reports the improvement in earth science education in Pennsylvania between 1958 and 1969. Discusses the earth science teachers' preparation and presents the percentage of teachers using five earth science textbooks. (RR)

Describes a geology course for earth science education majors offered by The Ohio State University in cooperation with Colorado State University. Relates the course activities around Boulder, Colorado and a camping trip through the Colorado Rockies. (RR)

Describes technological benefits of the United States space program. Programs and sources of further information are given. Examples include computer technology, information sciences, meteorological satellites, weather prediction, communications and education. (JM)

Presents tabulated data of questionnaire responses from 207 colleges. More than 30 groups of data are included relating to various aspects of geology programs including enrollment, student and faculty data and courses. (PR)

A model estimating the contributions of sulfur compounds by natural and human activities, and the rate of removal of sulfur from the atmosphere, is based on a review of the existing literature. Areas requiring additional research are identified. (AL)