YOUR ANSWERS ARE CORRECT GOOD JOB!
They are waiting for Macbeth<span> to arrive. When he enters the scene, he demands to hear the witches' predictions. They summon their "masters", three ghostly beings who provide </span>Macbeth<span> with vague warnings against </span>Mac Duff<span>, warnings that </span>Macbeth<span> does not listen to in the end.</span>
As you know, water evaporates in heat, and tropical places are usually very hot! Tropical implies "ocean" so, when an ocean evaporates it leaves a sandy ocean floor, which is a desert, but there are lake sized "puddles" of salt water left over, which is why there is a big salt water lake in the middle of Utah.