Part 5/8:
The geology of Mont-Saint-Michel is as captivating as its history. The granite that makes up the mount is estimated to be approximately 550 million years old, significantly older than the abbey itself. Erosion over the centuries has shaped its distinctive appearance. This natural resilience has been both a blessing and a curse, as what protects the mount also poses a threat; sediment deposits from powerful tides have gradually altered the bay's landscape, threatening the island's isolation and integrity.