Which mechanism causes distinct ridges known as 'arêtes' to form between adjacent glacial cirques in mountainous regions?

💡 Explanation

When ice accumulates in cirques, headward erosion occurs because repeated freeze-thaw action and glacial plucking carve out the mountainside, causing adjacent cirques to erode towards each other. Therefore, `arêtes` result, rather than weathering, moraine accumulation or isostatic rebound which require entirely distinct processes.

• Which effect accelerates when a permafrost active layer experiences increased thawing and saturation?
• Which erosional result characterizes coastlines when sand barriers impede wave energy?
• Which erosional effect accelerates cirque formation located on a northern-facing mountain aspect at high latitude?
• Which topographic outcome on a semi-arid plain results when strong winds preferentially erode fine sediments?
• Which mechanism drives the formation of elongated basins along oceanic transform faults?
• Which outcome occurs when glacial outwash deposits accumulate?