Data are given from which one can plot the planet's positions and movements. A star map is included.(EB)

A salt model was developed as a teaching tool to demonstrate the development of caverns and karst topography. Salt slabs are placed in a watertight box to represent fractured limestone. Erosion resulting from water flow can be photographed in time-lapse sequence or demonstrated in the laboratory. (Author/CP)

Describes relief model construction and compass exercises appropriate for the secondary school. (CP)

Assesses the motivational, esthetic, and career education oriented aspects of field trips. (CP)

Describes the experimental procedure used in determining the lifetime of tantalum-181. (CP)

Presents an undergraduate laboratory exercise in elementary statistics in which students verify empirically the various aspects of the Gaussian distribution. Sampling techniques and other commonly used statistical procedures are introduced. (CP)

Presents seven science experiments and activities for the junior high school level relating to electrostatics, electronics, magnetism, electricity and other areas of science. (HM)

Describes the construction and use of this simple apparatus designed to illustrate the phases of the moon. (BB)

A discussion is presented on the role of secondary teachers in public schools, followed by a sequence for teaching oxidation-reduction in secondary school chemistry courses. (BB)

Describes a project for sixth-grade science class students designed to encourage them to save energy at home, and to calculate the savings on their monthly bill. (GA)

This laboratory exercise integrates the topics of cell structure, classification of living organisms, and evolution. It is suitable for secondary or college biology courses and was used in an interdisciplinary science course for nonscience majors. (BB)

A gas pressure gauge has been constructed for use in a student experiment involving the law of atmospheres. From pressure data obtained at selected elevations the average mass of air molecules is determined and compared to that calculated from the molecular weights and percentages of constituents to the air. (Author/BB)

Describes a modified experiment to measure the internal resistance of an energy source, where a small resistance is connected in series with the source. (GA)