Proposes a new origin for comets in the solar system, namely, that comets originated in the breakup of a body orbiting the sun in or near the present location of the asteroid belt in the relatively recent past. Predictions related to the theory are discussed. (Author/JN)

Describes a simple outdoor pumping experiment that can illustrate basic concepts of hydrology to college students in an introductory earth science course. (Author/WB)

Focuses on the main naturally occurring ways in which compounds of carbon, nitrogen, and sulphur enter or leave the atmosphere. (Author/SA)

Describes the graphic construction of lunar eclipses and how lunar graphics are used. The meaning of some terms and concepts and a diagram for a total lunar eclipse are also included. (HM)

Describes a simple hydraulic simulator based on more complex models long used by engineers to develop approximate solutions. It allows students to visualize non-steady transfer, to apply a model to solve a problem, and to compare experimentally simulated information with calculated values. (Author/MA)

Presents ways classic literature materials can be used as supplements to an oceanography college course. (HM)

Summarizes some of the astronomy materials developed at the Lower North South Australian Science Teachers Association (SASTA) meeting of October, 1978. (HM)

Described is physical oceanography as analyzed by seven dependent variables, (three components of velocity, the pressure, density, temperature and salinity) as a function of three space variables and time. Topics discussed include the heat balance of the earth, current patterns in the ocean, heat transport, the air-sea interaction, and prospects…

Moh's scale for determining the hardness of substances is explained. Four classroom exercises are suggested. (MK)

Provides a survey and a review of earthquake activity and global tectonics from the advancement of the theory of continental drift to the present. Topics include: an identification of the major seismic regions of the earth, seismic measurement techniques, seismic design criteria for buildings, and the prediction of earthquakes. (BT)

Discussed are research procedures undertaken to determine the magnitude and timing of eustatic sea-level changes during the Tertiary Period. Data now becoming available give scientists a knowledge of conditions that may have been conducive to the formation of petroleum. (BT)

Describes a simple application of the seismic refraction method, using a two layer system, and extending it to a three layer system. (GA)

Proposes an activity whereby science students develop critical thinking skills. Students are to debate the belief that the earth is flat. Guidelines are provided. (MA)

Presents an activity whereby students describe the path of Mars through a background starfield. Includes purpose, materials, pre-lab, and procedure. Also provides guidelines for making a dial-a-planet wheel. (MA)

Descirbes a secondary science program designed to increase enrollment by offering semester courses. Thirty courses, in the biological and physical sciences, are offered for one semester and one-half credit. Earth science enrollment has increased significantly in the upper grade classes. Student evaluations are mostly favorable. (MA)