Why does temperature decrease with depth underwater?

1. Feb 22, 2015

youngdylz

Seems like an easy question yet I can't find an answer. Obviously the surface layer of the ocean gets more sunlight but I don't think that is the reason deep water is colder. The increase in pressure usually increases the temperature but this seems to be the exception. Thanks for taking the time to answer

2. Feb 22, 2015

Bystander

How does density depend upon temperature?

3. Feb 22, 2015

youngdylz

aha seems I was looking in all the wrong places. Thank you

4. Feb 22, 2015