Besides getting ample, gypsum is well refined into a powder for plaster or formed into sheets of wallboard. Hair or fibre and lime or clay may be added to plasters in the course of manufacture. The plaster coats, except for some complete coats, are sanded. See also Maritime Deposits: Gypsum may also be present in maritime deposits, often rela

Besi memang salah satu substansi yang sangat kuat. Sayangnya besi mudah mengalami korosi yang membuatnya berkarat dan rapuh. Korosi dapat terjadi karena air, udara, ataupun senyawa lain. Suhu ekstrem dan air, terutama air laut dan air hujan juga berpotensi menyebabkan besi berkarat. The initial design of fang and claw, adaptable backbone, muscu

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