Need to know the difference between a plant cell and an animal cell? What makes a reptile a reptile? How to label the parts of a flower? What radioactivity is? What causes ocean tides? Whether aluminum is a compound? Which planet takes the longest to circle the sun? What causes smog? Which of Newton\’s Three Laws of Motion is illustrated by a Pitcher throwing a curve ball? Everything You Need to Know About Science Homework provides fourth-to-sixth-grade students and their parents with the information they need to complete science assignments. With the help of Dial-A-Teacher, which has operated a telephone help line since 1979, the authors have compiled this science reference guide with easy-to-understand answers to students\’ most frequently asked questions. No other source offers such a full range of information directly related to the fourth through sixth grade science curriculum.