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Harrison Schmitt was the first and only geologist to land on the moon. Schmitt was the Apollo 17 Lunar Module Pilot. Apollo 17 was the last manned lunar landing. As LMP, it was Schmitt's job to tell the commander, Gene Cernan, speed and elevation during the lunar landing.

On the surface, Schmitt helped set up the experiments. After that, they boarded the Lunar Rover and drove to explore pre-designated spots. It was Schmitt's job to use the maps to guide Cernan to the geologic sites. On the way, Schmitt also described the sites he saw for the benefit of scientists at Missino Control.

Schmitt's value as a geologist proved invaluable when he found orange soil. Orange soil is significant because it is proof of volcanoes on the moon. The moon has a very thick 60km crust. It has been volcanically inactive for the last 3 billion years.

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Q: What did Harrison Schmitt do on the moon?
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