The original Earthquakes -A Teacher's Package for K-6 (FEMA 159) was developed as a joint effort of the Federal Emergency Management Agency (FEMA) and the National Science Teachers Association (NSTA) under contract with FEMA. NSTA's project team produced an excellent product. Since its publication in 1988, over 50,000 teachers have requested copies. This revised version brought members of the original project team together with a group of teachers who had used the materials extensively in their classroom and served as teacher-educators at FEMA's Tremor Troop workshops. About 75% of the original material remains unchanged: a few activities were removed and a few added. A major change was the addition of assessments throughout the units. The examples we provide relate to life outside the classroom and/or activities similar to those of scientists. We also added matrices linking activities to the National Science Education Standards. The Teacher's Package has five units. Each of the first four units is divided into three levels: Level 1, for grades K-2; Level 2, for grades 3-4; and Level 3, for grades 5-6. Since classes and individuals vary widely you may often find the procedures in the other levels helpful for your students. The last unit has four parts with activities for students in all grades, K-6. Unit L, Defining an Earthquake, builds on what students already know about earthquakes to establish a working definition of the phenomenon. Legends from near and far encourage children to create their own fanciful explanations, paving the way for the scientific explanations they will begin to learn in this unit. Unit I, Why and Where Earthquakes Occur, presents the modern scientific understanding of the Earth's structure and composition, and relates this to the cause of earthquakes. Unit II, Physical Results of Earthquakes, provides greater understanding of the processes that shape our active Earth. Earthquakes are put in the context of the large- and small-scale changes that are constantly at work on the continents as well as the ocean floor. Unit IV, Measuring Earthquakes, explains earthquakes in terms of wave movement and introduces students to the far-ranging effects of earthquakes. Unit V, Earthquake Safety and Survival, focuses on what to expect during an earthquake; how to cope safely; how to identify earthquake hazards; and how to reduce, eliminate, or avoid them.