A person in a boat floating in a small pond throws an anchor overboard. Does the level of the pond rise, fall or remain the same?

Explanation

The level of the pond falls. This is because the anchor displaces more water while in the boat. A floating object displaces a volume of water whose weight is equal to the weight of the object. A submerged objecct displaces a volume of water equal to the volume of the object. Because the density of anchor is greater than that of water, a volume of water that weighs the same as the anchor will be greater than the volume of the anchor.