Hydrous silica-rich magmas can degas through connected bubble pathways when as little as 20% crystals are present, influencing transitions from explosive, Vulcanian-style eruptions to lava effusion.
Experimental mineralogy and petrology
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Interior Water Not Ruled Out for Our Moon, Lab Tests Suggest
The experiments mimicked cooling of magma at the lunar surface. They found that any water in interior molten rock might have escaped so fast at the surface that none was left to be measured.