[dragnet2]

There are no volcanoes, active or dead, on Mars.

No?

Try this Martian volcano:

The largest of the volcanoes in the Tharsis Montes region, as well as all known volcanoes in the solar system, is Olympus Mons. Olympus Mons is a shield volcano 624 km (374 mi) in diameter (approximately the same size as the state of Arizona), 25 km (16 mi) high, and is rimmed by a 6 km (4 mi) high scarp. A caldera 80 km (50 mi) wide is located at the summit of Olympus Mons. To compare, the largest volcano on Earth is Mauna Loa. Mauna Loa is a shield volcano 10 km (6.3 mi) high and 120 km (75 mi) across. The volume of Olympus Mons is about 100 times larger than that of Mauna Loa.

http://marsprogram.jpl.nasa.gov/gallery/atlas/olympus-mons.html

[UCANSEE2]

OK, you got me. Shouldn’t have said ‘dead’. And for all we know, Mount Olympus may be the result of a large electrical exchange between two planetary bodies and not a volcano at all. Notice how the ‘pits’ are clustered around the perimeter of the volcano ‘top’? Ever seen a spot weld through a microscope ?

Can you show me any live volcanoes?

[UCANSEE2]