Making waves

Article Abstract:

Harvard University geophysicist Richard O'Connell's theory that buoyant masses of radioactive rocks in the lower mantle of the earth may explain why seismic patterns break up below 1,700 kms. Seismologist Rob D. van der Hilst believes that the rocks eventually disappear into the surrounding rock when heated up.

Research, Earth, Plate tectonics, Mantle (Geology), Geodynamics

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Raging rivers of rock

Article Abstract:

The high temperatures which linger for years after the eruption of volcanoes prevent plants from rooting in ash and stabilizing it. This results in the the formation of lahars which sweep down the volcano at speeds of up to 100-km per hour.

Methods, Environmental aspects, Lahars, Volcanic activity prediction

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