1 - NASA

The uppermost layer consisted of very dark grayish brown sandy loam ranging between 0.1 and 0.2 meters (0.3 and 0.7 feet) thick. This soil overlays a deposit of grayish brown clayey sand mottled with dark yellowish brown clayey sand that ranged between 0.1 and 0.2 meters (0.3 and 0.7 feet). ................
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