The teacher's edition for the Intermediate Science Curriculum Study Level III unit entitled "Crusty Problems" provides instructions for teachers. The main thrust of this unit is on examining some principles underlying geologic internal and external processes and shaping mechanisms of the landscpe. A brief introduction dealing with the plate tectonic theory is given in the beginning. Various chapters included in the unit are: "A First Look at Earth"; "The Mountains"; "The Midlands, a Pathway to the Sea"; and "The Shorelands". Major points and detailed instructions for teachers are provided for each chapter separately. Forty-seven resources are arranged into clusters and presented following each chapter to provide necessary information and activities usable by students to answer the incorporated questions. Students are requested to reason out the information required. Specific instructions for educational purposes, equipment, and material preparation are also included at the appropriate points. (CC)