Which outcome occurs when flowing basaltic lava encounters groundwater?

💡 Explanation

A phreatomagmatic eruption results because the rapid heating of groundwater by lava leads to explosive steam generation. This violent interaction causes fragmentation of lava, forming a tuff cone, rather than effusive flows alone.

• Which risk increases because excessive removal of vegetation occurs in permafrost regions?
• Which effect increases when the Earth's rotation speeds up?
• Which risk increases when rapid alluvial fan deposition blocks a mountain valley outlet?
• Which mechanism maintains lake level stability despite seasonal inflow variation within glacial lakes formed by isostatic rebound?
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• Which risk increases when transverse dune migration accelerates?