Explains why oil spills occur and how they are cleaned up and suggests strategies for preventing them in the future. Did you know that an oil spill occurs somewhere in the world almost every day of the year? Berger and Mirocha focus on one of the worst spills in history-the 1989 Exxon Valdez oil tanker spill-to explain in simple terms and with bold, full color illustrations why oils spills happen, how experts clean up after them, and what effect spilled oil has on ocean plants and wildlife.