There is only one sentence which needs a semicolon added to be correct, and that is <span>5) Water is not everywhere it's miles away.
As you can see, the way this sentence is written, something seems wrong - words are just mixed around incoherently. This is why we need a semicolon to make things more accurate: Water is not everywhere; it's miles away. </span>
Answer:
By providing a way to study for tests
