A beaker partially filled with water rests on a digital scale that measures the normal force exerted on the beaker. A solid metal block suspended by a vertical string is slowly lowered into the water until it is fully submerged. The block is held stationary and does not touch the bottom or sides of the beaker, and no water spills out. The reading on the digital scale increases. Which of the following statements provides the correct physical explanation for why the scale reading increases?