Which risk increases when pyroclastic flow deposits transform?

💡 Explanation

Lahars become much more likely after pyroclastic flows because hydrothermally altered ash rapidly weathers into unstable clay; therefore, torrential rainfall readily mobilizes these newly unconsolidated ash layers, rather than keeping them stable.

• Which risk dramatically increases when diverting surface runoff toward karst regions?
• Which consequence results when mountain streams erode floodplains?
• Which process significantly changes local weather patterns due to the rain shadow effect?
• Which landscape change occurs due to deflation when prevailing winds erode unprotected playa?
• Which outcome develops when longshore currents encounter a headland?
• Which mechanism sculpts ventifacts when persistent winds occur?