Which outcome occurs when glacial headwall freeze cracks within a cirque?

💡 Explanation

Cirque expansion proceeds due to the bergschrund repeatedly freezing and thawing, causing headwall sapping because freeze-thaw cycles exploit weaknesses and crack the rock via frost wedging. Therefore, the cirque expands rather than causing isostatic rebound or hydrothermal vent formation, which involve other geomorphic processes.

• Which geographic outcome is accelerated by enhanced carbonic acid dissolution?
• Which outcome accelerates ventifact formation on exposed bedrock?
• Which risk increases due to the effect of increased glacial sediment runoff into fjords?
• Which outcome changes stalactite growth rates upon speleothem saturation?
• Which outcome accelerates physical soil degradation when exposed?
• Following heavy tephra deposition, which outcome becomes increasingly likely due to changes in load distribution?