I believe it was El Salvador.
They are brought from colder regions e.g. the North and South poles where ice caps are melting to give cold water. Currents are due to the effect of wind on the water.
There are 272 words in the Gettysburg Address!
Sunny~ ☺
Since you did not give options, I will just help you out by saying that Implied Powers are powers that are <em>Not stated directly but are suggested to be true</em>
The primary case of Nigeria's water pollution would be oil spills.