On Thu, 18 Dec 2003 17:58:38 GMT, "Tom Gardner" wrote:
You're in a rowboat in a pool and there is a concrete block in the boat.
You drop the block into the water. Does the water level in the pool go up,
down or remain the same?

The water level goes down. That's because the boat has to displace an
amount of water equal to the weight of the concrete, while the concrete
itself only has to displace an amount of water equal to its volume. Since
concrete has a higher density than water, it displaces less water sunk
than when floated in a boat.

Gary