Which risk dramatically increases after extensive tephra deposition?

💡 Explanation

Extensive tephra deposition sharply raises lahar risk because infiltration reduces soil cohesion, causing debris flows; therefore rainfall-induced lahars are very dangerous, rather than blast radius effects or deep underground phenomena.

• Which effect explains jet stream deflection around elevated terrain like the Himalayas?
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• Which process causes uplift along a reverse fault boundary undergoing compression?
• Which process most directly shapes V-shaped valley into fjord after glacier retreat in coastal mountains?
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