Question

Which of the following can cause an increase in density that result in a deep ocean current?

The sun heats the water’s surface.
Warm water loses energy to its surroundings and cools.
A warm wind blows across cold water.
An iceberg melts, adding fresh water to ocean water.

Answer 1

Okay, so water is one of those weird molecules that are different than most (due to its bent shape because of the polarity between the elements H2 and O). With most molecules and compounds, the solid form is the heaviest form of the molecule/compound, then liquid, then gas as the lightest. Water does not apply to this. This is evident when we see that ice floats in the liquid phase of water. So the liquid phase is the heaviest state of water, then the solid phase, and then the gas phase as the lightest. Ice is about 9% less dense than water.

Ocean currents are normally created by wind. But they are also created by large density differences. In this case, I would say that answer D would be the most likely, but answer C would make sense. It's not A and, if it turns out that's the answer, send me a message and I'll delete my account.

Answer 2

XD, okay. Will do.

Answer 3

Thank you.