What happens to water when it freezes?
its mass increases.
its mass decreases.
its density increases.
its density decreases.

Option D

When water freezes, the phase changes from liquid to solid. Since, the phase change is a physical change not chemical change (no other substance is formed) thus, the mass of water remains the same.

But due to change of state, water expands on freezing and due to expansion its  volume increases.

Now, density (d) is related to mass (m) and volume (V) as follows:

Volume and density are inversely proportional to each other at constant mass thus, if volume increases, density decreases. This is the reason why ice floats on water.

Therefore, correct option is (d): its density decreases.

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

it would be a gas formation