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habitat – n. the place or type of place where a plant or animal naturally or normally lives or grows
hydrology – n. the part of science concerning the properties of the earth's water, and especially its movement in relation to the land
erosion – n. the gradual destruction of something by natural forces (such as water, wind, or ice): the process by which something is eroded or worn away
biomes – n. a biological community that has formed in response to a shared physical climate; can include more than one habitat
