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regolith
Regolith is a layer of loose, heterogeneous superficial material covering solid rock. It includes dust, soil, broken rock, and other related materials and is present on Earth, the Moon, Mars, some asteroids, and other terrestrial planets and moons. ==Etymology== The term ''regolith'' combines two Greek words: ''rhegos'' (ῥῆγος), "blanket", and ''lithos'' (λίθος), "rock". The American geologist George P. Merrill first defined the term in 1897, writing:
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