A mineral<span> or rock that contains a </span>useful substance<span> that can be mined for a profit. metallic elements that turn into liquid, flow into weaknesses in rocks, and become solid in the rock.</span>
The correct answer is C. Direct democracy.
In it, the people directly vote vote on policy initiatives, unlike nowadays where representative democracy dominates.
They changed the two-field crop rotation to a four-field crop rotation which allowed the farmer to grow food more consistently and the rotation from a root vegetable to a grain in the fields also allowed the cattle to be fed and the excess grain to be sold