Question

multiple - choice question
what can cause a change in density?
change in salinity
change in temperature
a change in either and/or both temperature and salinity.
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Explanation:

• Density is calculated as mass divided by volume ($

ho=\frac{m}{V}$).

• For water, when salinity increases (more dissolved salts, more mass for the same volume), density increases.
• When temperature decreases (for water, as it cools below 4°C it expands a bit, but generally for many substances, cooling can change volume; for water in the ocean, thermal expansion: warmer water is less dense (volume increases for same mass) and colder water is more dense (volume decreases for same mass in the relevant range). So both salinity and temperature can affect density.

Answer:

C. a change in either and/or both temperature and salinity.