встречаться в природе
• Graphite is found naturally (or occurs in nature) in Siberia, Ceylon, ...
• Ferroso ferric oxide occurs naturally as magnetite.
Источник:
Русско-английский научно-технический словарь
на Gufo.me
• Graphite is found naturally (or occurs in nature) in Siberia, Ceylon, ...
• Ferroso ferric oxide occurs naturally as magnetite.