Answer: On the Moon, the gravitational force is about 1/6th of that on Earth. However, the buoyancy of an object in a fluid depends on the density of the object relative to the fluid, not the gravitational force. A rock will sink in water if its density is greater than that of water, regardless of the gravitational force. Therefore, the rock will sink in the water on the Moon just as it does on Earth, assuming the water's density remains the same. The weight of the rock is less on the Moon, but its density relative to the water is unchanged, so it will behave the same way in terms of sinking.
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