Some types of minerals form balls called what?
- Correct Answer: fistulas
- cancers
- microbes
- nodules
Explanation: Some types of minerals form balls called nodules. Nodules may be tiny or as big as basketballs. They contain manganese, iron, copper, and other useful minerals. As many as 500 billion tons of nodules lie on the ocean floor! However, mining them would be very costly and could be harmful to the ocean environment.
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