Arctic underwater ridge

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We’re looking for an underwater ridge that’s part of the continental crust below the Arctic Ocean and crosses the North Pole. From the New Siberian Islands, the ridge runs across the Arctic Ocean all the way to Canada’s Ellesmere Island. What is it called? Download MP3

From pole to pole

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Our Geo Quiz asks you to estimate the distance from the North Pole to the South Pole. Here’s a clue: Earth’s circumference, at the equator, is about 25,000 miles. Can you do the math? Download MP3

Search for a Norwegian hero

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Two Norwegian vessels are searching for the remains of a seaplane that crashed more than 80 years ago on its way back from the North Pole. It belonged to legendary Norwegian explorer Roald Amundsen. Anchor Jeb Sharp speaks with Rob McCallum, the leader of the expedition, to find out where they are looking…and why now.