Science Starters, These engaging books provide a clear Introduction to science and the environment. Find out how human activities are affecting our planet and what we can do to help. Short blocks of text, lively photos, and attractive artwork make concepts easy to understand. A quiz at the end of each book lets readers test what they've learned. Pollution, Pollution happens when something harmful goes into the environment. Find out about different forms of pollution, what causes them, and how we can keep our planet clean. Book jacket.