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Fraser
2005-Sep-07, 05:14 PM
SUMMARY: This is an image of the Biblis Patera volcano's caldera which was taken by the ESA's Mars Express spacecraft. Biblis Patera is nearly 170 km (106 miles) long, 100 km (62 miles) wide, and its summit is 3 km (1.9 miles) high. The bowl-shaped caldera might have formed when a magma chamber collapsed during an eruption of the volcano.

View full article (http://www.universetoday.com/am/publish/biblis_patera_volcano.html)
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galacsi
2005-Sep-08, 10:10 PM
Hi

I got an idea : On earth volcanoes are driven by gases ,mainly steam . On mars where it is so cold may be this steam become water with a layer of ice on the surface. So maybe the martian volcano is more a mud volcano than a true lava volcano