Up-to-date knowledge about Skylab experiments is presented for the purpose of informing high school teachers about scientific research performed in orbit and enabling them to broaden their scope of material selection. The second volume emphasizes the sensing of earth resources. The content includes an introduction to the concept and historical significance of remote sensing, a discussion of major scientific considerations involved in remotely sensing the earth, and descriptions of experiments with multispectral photographic facility, infrared spectrometers, multispectral scanners, microwave scatterometers and altimeters, and L-band radiometers. Experiment background, scientific objectives, application of equipment, and data output are explained in each description. Related curriculum activities, suggested classroom demonstrations, and an outline for the relationships between experimental data and instructional materials are presented. Included in the appendices are additional remote sensor information, a glossary of terms used in this volume, and a selected bibliography. (CC)