The Giant's Causeway formed how many million years ago?

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Multiple Choice

The Giant's Causeway formed how many million years ago?

The key idea is that the Giant’s Causeway formed during a volcanic flood of basalt that erupted tens of millions of years ago. When the lava spread and cooled, it contracted and cracked into a network of near-hexagonal columns, creating the distinctive basalt formations you see today. This cooling-and-cracking happened roughly 50 million years ago, during the period of North Atlantic volcanism, so 50 million years ago is the best fit among the options. Other times like 20, 40, or 15 million years ago are outside the typical window scientists assign to those basalt flood events, so they don’t match the geological record as well.

The key idea is that the Giant’s Causeway formed during a volcanic flood of basalt that erupted tens of millions of years ago. When the lava spread and cooled, it contracted and cracked into a network of near-hexagonal columns, creating the distinctive basalt formations you see today. This cooling-and-cracking happened roughly 50 million years ago, during the period of North Atlantic volcanism, so 50 million years ago is the best fit among the options. Other times like 20, 40, or 15 million years ago are outside the typical window scientists assign to those basalt flood events, so they don’t match the geological record as well.

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