text: The bowling ball.  Since you were not specific in how you were going to get 25,000 feet above the ground, I am going to assume that you are on top of the Pacific Ocean.  The ball will sink into the depths around the Marianis Trench and hit the ground some 4 1/2 miles underwater.  The pencil will float on the surface until it gets waterlogged.  It may sink but it will be much later than the ball.\n\nWhat will those fish do with a bowling ball anyway?  Bowling pins will float.