Procedures for using soap films to determine the shortest series of lines connecting several points. (CP)

Describes fecal pellet identification as a technique for animal population surveys. (CP)

Using winter snow, kindergarten students can explore the properties of water. Students demonstrate melting, freezing, expansion, and evaporation through a number of activities involving a paper cup and a scoop of snow. Procedures and student reactions are described in detail by the teacher-author. (MA)

Describes the method to use in collecting freshwater algae for study in the classroom. Equipment lists are given as well as several illustrations. (SA)

Discusses methodology for several activities which use Alka Seltzer tablets as a source of carbon dioxide gas. (CS)

Describes a two-day field trip, along with follow-up classroom activities and experiments which relate to water resources and water quality. Discusses how trips to a lake and water treatment facilities can enhance appreciation of water. (TW)

Describes activities which demonstrate the abundance of organisms living underground. Provides outlined directions, lists of materials, and a soil ecosystem transparency for delving into the properties of soil. (RT)

This standard lesson on identifying salt and sugar crystals expands into an opportunity for students to develop their observation, questioning, and modeling skills. Although sugar and salt may look similar, students discovered that they looked very different under a magnifying glass and behaved differently when dissolved in water. In addition,…