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limestone & clay
chalk & graphite
clay & graphite
limestone & graphite
Cement is usually a mixture of:
Chemical composition of heavy water is:
Chemical formula of washing soda is
Chemical name of common salt is
Chemical properties of isotopes
Chernobyl disaster is the result of pollution by
Chile saltpeter is the common name of:
Chlorination is a process used for water purification. The disinfecting action of chlorine is mainly due to
Chlorine is not used in the preparation of
Chocolates can be bad for health because of a high content of