註釋
"Every day the sun rises and sets. The moon appears to change in size and shape every night each month. The water in the ocean rises and falls along the shore. every year there are four seasons. These patterns have been occurring for billions of years because of the teamwork of the moon, Earth, and sun. You will learn 20 new science Smart Words to help you understand how our planet and its moon interact with the sun to cause predictable, and sometimes phenomenal, events."--Page 4 of cover
Includes index.
