Table I: Earth and Lunar Crustal Compositions only hydrogen, at approximately 50 ppm, exists in only trace quantities on the Moon. In addition, sodium and potassium are only one-twenty-fifth to one-tenth as plentiful on the Moon as on Earth. A distinguishing characteristic of the lunar crustal surface is its relatively homogeneous composition as compared to Earth. While there is some distinctive difference in composition between mare and highlands soil, particularly with respect to titanium, iron and aluminum, there is little variation from location to location within each of the two areas, insofar as determined by soil analyses conducted to date.
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