Which continents does the arctic circle pass through?

The separation of northern ireland from the republic of ireland is an example of

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed

What gigantic island is primarily in the arctic circle?