Which outcome arises when a lake blocks volcanic lahar flow?

💡 Explanation

Upstream aggradation occurs because deposition exceeds erosion where the lake acts as a barrier reducing the lahar's velocity and sediment-carrying capacity, therefore sediment accumulates upstream rather than flowing onward, altering stream morphology.

• Which outcome results when eolian transport encounters topographic obstruction?
• Which pattern results when differential ice ablation occurs?
• Which effect results when seasonal shifts modify jet stream position relative to a mountain range?
• Which outcome from pyroclastic density flows increases erosion rate?
• Which outcome occurs when lava cools as pahoehoe?
• Which outcome results when pyroclastic flows enter a drainage basin?