Describes caves, including how they form, the plants and animals found in caves, and how people and weather change caves. Also includes information on caves found in North America, and in the world.
"Provides a description of the plains and explains how they form and change, along with some information on the kinds of plants and animals that can be found on the plains. Plains found in North Ameri
"Provides a description of hills and explains how they form and change, along with some information on the kinds of plants and animals that can be found on hills. Hills found in North America and in t
Provides a description of hills and explains how they form and change, along with some information on the kinds of plants and animals that can be found on hills. Hills found in North America and in th
"Provides a description of lakes and explains how they form, along with some information on the kinds of plants and animals that can be found in lakes. Lake Superior and the Caspian Sea are highlighte
Provides a description of islands and explains how they form and change, along with some information on the kinds of plants and animals that can be found on islands. Islands found in North America and
Describes volcanoes, including how they form, the plants and animals found near volcanoes, and how people and weather change volcanoes. Also includes information on the volcanoes found in North Americ
Provides a description of rivers, and explains how they form, along with some information on the kinds of plants and animals that can be found in and around rivers. The Mississippi and Amazon Rivers a
Describes archipelagoes, including how they form, the plants and animals found on archipelagoes, along with how people and weather change archipelagoes. Also highlights some archipelagoes in North Ame
