Multiple choice

Black Twins is a name given to

  1. manganese and copper

  2. iron and coal

  3. aluminum and Zinc

  4. limestone and gypsum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Iron and coal are fundamental industrial minerals often referred to as 'Black Twins' because both are black-colored, carbon-rich materials essential for industrialization. Manganese and copper are not historically paired this way. Aluminum and zinc, limestone and gypsum are also not called 'Black Twins'.

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