peak – n. the highest level or value of something

eternal – adj. continuing forever

symbol – n. a sign or object used to represent something

survey – n. an examination of the structure of something

avalanche – n. a large amount of snow that falls down the side of a mountain

GPS – n. (abbreviation for global positioning system) - a radio system that uses signals from satellites to tell you where you are and to give you directions to other places

milestone – n. an important point in the progress or development of something
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