Why is ice less dense than water?

Ice has a very different structure than liquid water

Explanation:

the lattice arrangement allows water molecules to be more spread out than in a liquid, and, thus, ice is less dense than water.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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