Most lakes were formed from Melting glaciers. Because when the glaciers melted they became lakes.
Hope this helps.
Pretty sure its called the 38th Parallel, or the Demilitarized Zone. :)
I would say Afghanistan or maybe North Korea
Salt water is a homogeneous mixture or a solution.
The mountains have emerged where the tectonic plates meet. The collision of the tectonic plates can disrupt the earth causing earthquakes as well as the growth of a mountain. These mountains take awhile to become the giants they are.