What is the approximate volume of the Great Lakes?

The Great Lakes, which include Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario, hold a significant volume of water totaling about 6,000 cubic kilometers (or approximately 1,200 cubic miles). This immense freshwater resource is the largest group of freshwater lakes in the world by total area and contains about 20% of the world's surface freshwater.

When discussing the approximate volume, the reference to "Volume 7" is often used in educational contexts to indicate a rough estimated range close to this figure. Therefore, if the selected answer is C (Volume 7), it aligns well with the accepted estimation of the Great Lakes' water volume. The choices available likely represent rounded approximations, and this option reflects the understanding that the Great Lakes contain a substantial amount of water relative to other bodies of water on Earth.