A description of a field experience to demonstrate some basic principles concerning the geologic transport of beach sands. (Author/CP)

Uses a vortex device as a model to study low-pressure systems and other related investigations. (LS)

Describes student activities with mercuric oxide and mercury that help them to form models of the solar system and its creation. (JR)

Describes a lab investigation designed to introduce students to soil compaction and help them to learn to design and adapt procedures that scientists use when they plan and conduct controlled investigations. Provided are objectives, a list of materials, procedures, and a sample student handout. (CW)

Describes a demonstration to show the character and behavior of mixing clouds. Discusses laminar and turbulent flow, and the formation of contrails and other cloud phenomena. (CW)

Presents an activity that models the changes in the concentration of carbon dioxide gas in the atmosphere during the last 200 years as determined from glacial records. (PR)

Describes an activity where students generate a plan and test their ideas on trying to cope with a small oil spill. (PR)

Describes an activity measuring the amount of dissolved carbon dioxide in carbonated water at different temperatures. The amount of carbon dioxide is measured by the amount of dilute ammonia solution needed to produce a pH indicator color change. (PR)