A small boat is floating in a swimming pool. You have a rock which you will throw into the pool. Will the water level rise higher if:
a) the rock is thrown into the boat?
b) the rock is thrown into the pool? OR
c) the level would rise equally if the rock were thrown into the boat or directly into the pool.

ANSWER
If the rock were thrown into the pool, it would displace its volume of water. But if the rock were thrown directly into the boat, it would displace its weight of water. Therefore, the water level would rise higher if the rock were thrown into the boat.