The Moon, Luna, has a crust composed primarily of oxygen, silicon, magnesium, iron, calcium, and aluminum.  Minor traces of titanium, uranium, thorium, potassium, and hydrogen have also been detected.  These elements are chemically bound into various molecular materials and make up what we can see on it's surface.

The lunar surface offers incredible opportunity for mankind, especially as a strategic base of operations.  If we are to achieve the vision articulated by H2Orbit then the current view of "Why The Moon" needs to be expanded both in breadth and depth.  That expanded view is required because the reasons for being there are not "explorations of discovery" they are "saving Earth's biosphere".  A radically different paradigm.

Virtually all of the information gained as a result of the various Lunar missions is available on the Internet, including applications to receive actual samples of lunar materials.  The Moon offers low gravity real estate rich with mineral resources from which we can base an array of missions as we implement the solution required to get us out of the situation we are in.