정의
Rock salt. Deforms plastically under pressure, which is why it rises into domes and traps oil against their flanks.
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Cement
Powdered limestone and clay cooked at 1,450 C, which sets hard when mixed with water — the glue that holds concrete…
Potash
Potassium salts mined from ancient dried-up seas — the K in NPK fertiliser, which plants need to move water and…
Salt
Sodium chloride — the seasoning on a table, and the feedstock for the chlorine and caustic soda that most of the…