Why do you think mining on land would be less costly than mining in the ocean?

Explanation:

Because dense minerals are heavier and drop to the stream bottom, lighter minerals are carried along in the current of the stream. Why do you think that mining on land is less costly than mining in the deep ocean is? It is easier to get to land than the ocean and you need special equipment to go under water.

energy and particles

that is wrong, its not thymus.