Mind you, the fountain height record is 1900 feet set by Kilauea Iki 63 years ago. Kilauea itself is on the slope of Mauna Loa, the largest volcano on Planet Earth, measuring 13,659 feet high, but the peak is almost eleven miles (56,000 feet) above the base at the bottom of the ocean. Mount Everest is only 29,029 feet tall.
So where does a rainbow come into this discussion? Well, yesterday, I golfed at the Ala Wai Golf Course, and there were rainbows all day: