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Letters Home from Yosemite

STUDY
PLAY
glacier
large ice mass that moves slowly down a mountain or across land
impressive
able to have a strong effect on the mind or feelings
naturalist
a person who studies living things
preserve
to keep from harm or change; protect
species
a set of related living things that share certain characteristics and that can breed
slopes
land that goes up or down at an angle
wilderness
a wild region with few or no people living in it