Huge chunks of the glacier broke off and slid into the water. Word Definition Picture Sentence A great mass of ice that moves very slowly over a land area. glacier Huge chunks of the glacier broke off and slid into the water.

impressive Word Definition Picture Sentence able to impress the mind, feelings, conscience impressive Yosemite Valley is an impressive sight.

a person who studies living things naturalist Word Definition Picture Sentence a person who studies living things naturalist John Muir was a naturalist who helped save the Yosemite Valley and other wilderness areas.

preserve Word Definition Picture Sentence to keep from harm or change; protect preserve Sequoia National Park was created to preserve the Giant Sequoia trees and other natural resources.

Every winter, the slopes are full of skiers and snowboarders. Word Definition Picture Sentence slopes land that go up or down at an angle Every winter, the slopes are full of skiers and snowboarders.

We can see many species of birds in the forest. Word Definition Picture Sentence a set of related living things that share certain characteristics and that can interbreed species We can see many species of birds in the forest.

I like to camp out in the wilderness, away from the city. Word Definition Picture Sentence a wild region with few or no people living in it wilderness I like to camp out in the wilderness, away from the city.