- altitudes: heights above Earth
- formations: things that are formed
- glacier: a great mass of ice that moves very slowly down a mountain or along a valley, or spreading very slowly over a land area
- impressive: able to impress the mind, feelings, or conscience
- naturalist: a person who studies living things
- preserve: to keep from harm or change; protect
- reservoir: a place where water is collected and stored for use
- slopes: land that goes up or down at an angle
- species: a set of related living things that share certain characteristics and that can interbreed
- wilderness: a wild region with few or no people living in it