In lines 17-18, the author mentions the "expansion of halite crystals...by heating and of sulfates

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In lines 17-18, the author mentions the "expansion of halite crystals...by heating and of sulfates and similar salts by hydration" in order to

present an alternative theory about crystal growth

explain how some rocks are not affected by salt

simplify the explanation of crystal prying and wedging

introduce additional means by which crystals destroy rocks

Giải thích

Thông tin: Besides crystal growth, the expansion of halite crystals (the same

as everyday table salt) by heating and of sulfates and similar salts by hydration can

contribute additional stresses.

Chọn C