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Anonymous
I will now use the power of science to explain what has happened.
Intermolecular forces between the sand and the water caused the water to be pulled out of the sponge and into the sand. Normally, water is held in a sponge because the water is attracted to a sponge more than it is attracted to air. Sand is different from air however. Because of its molecular nature and high surface area it provides lots of nice surfaces for water to bond too. This effectively means water in the sand is at a lower pressure than water in the sponge. Since fluids move from areas of high pressure to areas of low pressure, the water left the sponge and entered the sand.
To fix this coat the sand in a hydrophobic material.
Or, put the sponge on a bowl or something.
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