ancient - very old, astronomers - scientists who study the stars, galaxies - a collection of stars, dust and gas, peak - the top of a mountain, crevasses - deep cracks in a glacier or earth's surface, trekking - activity of walking long distances by foot, leapt - jumped, span - full reach or length between 2 points, techniques - methods or skills need to bring about a result, inject - to force into something, archaeologist - a scientist who learns about ancient people, civilization - a society of cities, a government, jobs and social classes,

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