Beginning readers will learn about the basic patterns of the Sun and Earth and what causes day and night.

Hibernation is a cycle that some animals go through every year. Most people know that bears hibernate. But why do they hibernate? And what other animals hibernate?

What does it mean to migrate? Discover which animals migrate and why they migrate through detailed photographs and simple text.

Winter, spring, summer, and fall—the seasons are one of nature's most familiar cycles. But why does the weather change? Learn why weather patterns change over the seasons.

From lakes, to clouds, to rain that falls back to Earth—discover how water changes through various processes to form the water cycle.