Why lake coatepeque in el salvador turns turquoise?

Lake Coatepeque in El Salvador turns turquoise due to a combination of factors, primarily the presence of volcanic minerals and algae. The lake, formed in a volcanic caldera, contains high levels of dissolved minerals and nutrients that promote the growth of specific algae, which can impart a vibrant blue-green color to the water. Additionally, sunlight and water clarity enhance this turquoise appearance, especially during certain times of the year when conditions are optimal for algal blooms.