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.

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