ocr: U9 97 . By way of comparison, the Hawaiian volcanoes of Mauna Loa and. Mauna Kea, the tallest MARS: GENERAL INFORMATION mountains on Earth, measure only about 9000 meters, of MAMSS SATELLITES which 5000 meters is submerged beneath the waves of the Pacific Ocean... Most Martian mountains are in fact volcanos; some are extremely ancient, almost 4 billion years old. Their bases can measure several hundred kilometers in diameter: Hadrica Patera, for example, al primitive volcano in the area of Hellas, is 600 Kilometers in diameter. Olympus Mons is as large, but is more recent, dating back only abo ...
