![]() This lava flow, produced by a fissure eruption, was about five years old when the photograph was taken. Sea floor pillow basalts on the Juan de Fuca Ridge, a divergent plate boundary located about 150 miles (240 kilometers) west of the Washington-Oregon coast. Younger basalt flows will have fewer craters. The ages of lunar maria can be estimated by observing the density of impact craters on their surface. ![]() These areas of the Moon are known as "lunar maria." Large areas of the Moon have been resurfaced by extensive basalt flows which may have been triggered by major impact events. Much of the Moon's surface is underlain by basaltic lava flows and flood basalts. Basalt on Moon and Marsīasalt is also an abundant rock on the Moon. Although basalt is much less common on continents, lava flows and flood basalts underlie several percent of Earth's land surface. Most areas within Earth's ocean basins are underlain by basalt. Earth's Most Abundant Bedrockīasalt underlies more of Earth's surface than any other rock type. ![]() It is about 375 miles (600 kilometers) in diameter and 15 miles (25 kilometers) high. Olympus Mons is the highest topographic feature on Mars and is the largest known volcano in our solar system. ![]() Olympus Mons Volcano: This shield volcano is composed of basalt and has enormous calderas at the summit. ![]()
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