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Scouring Iceland, the world's largest volcanic island, for clues about the powerful forces that are ripping the landscape apart and lighting its volcanoes.
Asteroids might provide clues about the formation of early Earth; detective work uncovers that a big nickel deposit in Canada, vast oil reserves in the Gulf of Mexico and a gold mine in South Africa all resulted from asteroid impacts.
Volcanoes, landslides and tsunamis are among the forces that shape the Hawaiian islands; Hawaii's volcanoes might hold clues to the inner workings of the planet.
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