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Ascraeus Mons is the northernmost of three volcanos (collectively known as Tharsis Montesmarker) on the Tharsismarker bulge near the equator of the planet Mars. To its south is Pavonis Monsmarker, and south of that is Arsia Monsmarker. The highest volcano in the solar system, Olympus Monsmarker, is to the northwest. The three Tharsis Montes, together with some smaller volcanoes to the north form a rather straight line. This arrangement suggests that they were formed by a crustal plate moving over a hot spot. Such an arrangement exists in the Earth's Pacific Ocean, especially with the Hawaiian Islands. The Hawaiian Islands are in a straight line, with the youngest in the south and the oldest in the north. So geologists believe the plate is moving while a plume of hot magma rises, then punches through the crust to produce a volcanic mountain.

Ascraeus Mons is considered to be one of the highest volcanoes on Mars. Its summit is about 18 km above Mars' mean surface level and experiences an atmospheric pressure less than 0.8 mbar (80 Pa). It is 460 km in diameter, and was formed from relatively recent liquid lava flows .

Image:Ascraeus Mons2.JPG|Channels on the northwest side of Ascraeus Mons. Some may be collapsed lava tubes.

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