All liquids in containers have a concave meniscus. This is because surface molecules being attracted to each other and also to the sides of the containers. Lakes also have a concave meniscus, but they are so large we don\'t notice it. Solution All liquids in containers have a concave meniscus. This is because surface molecules being attracted to each other and also to the sides of the containers. Lakes also have a concave meniscus, but they are so large we don\'t notice it..