WEBVTT
Kind: captions
Language: en

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Here in the Gulf of Alaska, chains of volcanic&nbsp;
mountains are lined up across the sea floor.&nbsp;&nbsp;

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These underwater mountains were created as a&nbsp;
tectonic plate moved over volcanic hot spots.&nbsp;&nbsp;

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Starting from high above the Bering Sea we'll&nbsp;
fly through this field of seamounts. The first&nbsp;&nbsp;

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mountains we fly by are the oldest, at almost&nbsp;
35 million years, and become younger as we go&nbsp;&nbsp;

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to the southeast. Some of the volcanoes of the&nbsp;
southeast end of these chains are still active.