CSET Multiple Subjects Subtest 2 Math And Science Practice Test

Which rock is formed by the evaporation of seawater?

Rock Salt Sandstone Silkstone Shale

Correct Answer:

Rock Salt

Explanation:

Rocks formed by evaporation of seawater are evaporites, minerals that precipitate from concentrated brines as water evaporates. When seawater in a restricted basin dries up, salts like sodium chloride become supersaturated and crystallize, producing rock salt. This contrasts with sandstone, which forms from cemented sand grains; shale, from compacted clay particles; and silkstone, which isn’t a typical evaporite rock. So rock salt is the correct choice.

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