Twins Lil and Nelly, who are total opposites in their likes and dislikes, get a surprise when Nelly secretly makes some additions to Lil's school writing project.

"It all started with water. But how did one river make such a deep canyon? Read on and find out"--Back cover.

Simple text describes the Rocky Mountains and the animals and people that live there.

"Niagara Falls is beautiful and exciting. Read along to discover how the Falls were made and the history that surrounds them."--

Illustrations and simple text explain what wind is, how it is used by plants, birds, and people, and how wind can become a storm.

"Look up and see the wonders of our night sky. Explore the stars, planets, and more that we see in our night sky in this stellar book!"--Page [2] of cover.

Illustrations and simple text explain three types of clouds, stratus, cumulus, and cirrus.

"With her trademark simple but lyrical text enhanced by John Wallace's irresistible illustrations, Marion Dane Bauer describes the wonders of the Appalachian Trail for Level One beginning readers"--

"Learn all about planet Earth in the third book in this nonfiction Level 1 Ready-to-Read series about the universe that's perfect for kids who love science and space!"--

"Explore the planet Mars in the second book in this new, nonfiction Level 1 Ready-to-Read series about the universe that's perfect for kids who love science and space!"--