A low rumble gets louder and louder. The walls start to shake. Objects fall to the floor. An earthquake has hit! Earthquake scientists rush to scenes like this, to better understand the causes of earthquakes and predict when they will hit. Put science skills to work to help a city prepare for the next big quake. Readers use charts, tables, and scientific diagrams to solve the same type of science problems experts face every day. Grades 3 and up. Save $1 per book when ordering 10 or more copies.