Shield volcano Mars are very similar to the shield volcanoes on Earth. Both have gently sloping flanks, collapse craters along their central structure, and are built of highly fluid lavas. Volcanic features on Mars were observed long before they were first studied in detail during the 1976–1979 Viking mission. The principal difference between the volcanoes of Mars and those on Earth is in terms of size; Martian volcanoes range in size up to high and in diameter, far larger than the high, wide Hawaiian shields. The highest of these, Olympus Mons, is the tallest known mountain on any planet in the solar
Mount Olympus (Utah) Mount Olympus (Utah) Mount Olympus in the U.S. state of Utah is one of the most prominent and recognizable mountains viewable from practically every location in the Salt Lake Valley. Mount Olympus is not the tallest peak along the Wasatch Front, but its unusual form and location make it a popular hiking destination for locals. The mountain is situated immediately east of the center of the Salt Lake Valley (due east from Murray and Taylorsville). Distinctive features of the mountain are its twin peaks and other outcroppings, the highest of which is called "Summit Peak" and which towers above the