Here's why:
* High Altitude Conditions: High altitudes in the Alps experience frequent cycles of freezing and thawing. Water seeps into cracks in rocks during the day. When temperatures drop below freezing at night, the water expands, putting pressure on the rock.
* Repeated Cycles: This repeated freeze-thaw cycle weakens the rock, causing it to break apart. The broken rock fragments are then easily transported downhill by other erosive forces like wind, gravity, and glaciers.
Other Sources of Erosion in the Swiss Alps:
While freeze-thaw is the most common, other factors contribute to erosion:
* Glaciers: Glaciers are powerful agents of erosion. They carve out valleys, transport rock debris, and leave behind distinctive landforms.
* Wind: Strong winds at high elevations can pick up loose rock fragments and erode exposed rock surfaces.
* Gravity: Gravity plays a role in landslides and rockfalls, which are common in the steep, mountainous terrain of the Alps.
Overall, the combination of these erosive forces shapes the unique and dramatic landscape of the Swiss Alps.
