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L

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Volcanoes can quickly become active

New research results suggest that magma sitting 4-5 kilometers beneath the surface of Oregon's Mount Hood, has been stored in near-solid conditions for thousands of years.
The time it takes to liquefy and potentially erupt, however, is surprisingly short--perhaps as little as a couple of months.
The key to an eruption, geoscientists say, is to elevate the temperature of the rock to more than 750 degrees Celsius, which can happen when hot magma from deep within the Earth's crust rises to the surface.

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L

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Mount Hood is a huge draw for skiers, climbers and hikers. Volcano researchers, not so much.
As volcanoes go, the mountain is monotonous. In Mount Hood's half-million-year history, it hasn't had the explosive, top-blowing eruptions of Mount St. Helens and others among its Northwest sisters. The lava that oozes out when it erupts shows the same chemical composition time after time.

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