Young children often look at the world around them and ask the question, "Why?" Why is it light out when I have to go to bed in the summer? Why can't I see stars after lunch? Why can't it snow if it's warm out? This set offers young readers these answers through achievable language and simple, clear explanations. Full-color photographs accompany each scientific concept, giving readers an up-close look at each title topic. This early look at earth science will surely excite little explorers!