Volcano, Lava domes
Landforms of this sort consist of steep domal mounds of lava so viscous that the lava piles up over its vent without flowing away. The rock types that form lava domes are generally andesites, dacites, or rhyolites. Somehow these viscous lavas have lost much of their gas content in prior eruptions or by slow rise to the surface. Even so, it is not unusual for an actively
posted by SuddenCat @ 10:42 AM
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