As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor. Eventually, the crust cracks.
The Caspian Sea <span>is the largest lake or inland sea in the world. Is it below sea level and is located east of the Caucasus Mountains. It is a natural boundary between Europe and Asia.
