The British Isles rock. That's a subjective cultural claim, certainly, but it's also an empirical truth – because it's geology that has created our diverse and extraordinary natural wonders. We owe the creation of vertiginous cliffs and sea stacks to deposits of sandstone and chalk; soft limestone has been etched and scoured to carve craggy gorges, coastal arches and echoing caverns; and sculpted from extrusions of volcanic basalt are the weirdly geometric columns of causeways and sea caves.
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