5. to surround or enclose completely; to swallow up A. effect
B. rupture
C. engulf
D. aquifer

what is the context here? we need to know what story you're talking about : )

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.