Foreshadow or flashback? The sight of the little waterfall reminded Nick of Niagara Falls. Then he was there, before the dramatic falls. He was wearing that heavy black raincoat. He was surrounded by mist.

onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.

i think the answer would mist likely be an adjective clause, because unhappy is an adjective.