Describe the process of rock identification using the following words:
to look alike, fine-grained, skill, to identify, to cut, a peace of rock, diamond saw, to polish, surface,
until, smooth, to cement, glass slide, paper thin, to examine, under microscope, polar
oid light, to depend (on), angle, pattern, texture, color, hardness, relative weight
Find synonyms among the following words:
man-made, to look for, layer, to change, help, strange, artificial, bed, to search for, odd, stratum, aid,
to alter, pure, to eliminate, dirty, to remove
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