ScienceDaily: Top Science News |
- Giant ice avalanches on Saturn's moon Iapetus provide clue to extreme slippage elsewhere in the solar system
- New dimension of physics research: Cutting the graphene cake
- Magnetic field, mantle convection and tectonics
- Chronic 2000-04 drought, worst in 800 years, may be the 'new normal'
| Posted: 29 Jul 2012 11:22 AM PDT Saturn's ice moon Iapetus has more giant landslides than any solar system body other than Mars. Measurements of the avalanches suggest that some mechanism lowered their coefficients of friction so that they flowed rather than tumbled, traveling extraordinary distances before coming to rest. Scientists who have been studying the ice avalanches suggest a experimental test that might provide some answers. |
| New dimension of physics research: Cutting the graphene cake Posted: 29 Jul 2012 11:21 AM PDT Researchers have demonstrated that graphene can be used as a building block to create new 3D crystal structures which are not confined by what nature can produce. Sandwiching individual graphene sheets between insulating layers in order to produce electrical devices with unique new properties, the method could open up a new dimension of physics research. |
| Magnetic field, mantle convection and tectonics Posted: 29 Jul 2012 11:21 AM PDT On a time scale of tens to hundreds of millions of years, the geomagnetic field may be influenced by currents in the mantle. The frequent polarity reversals of Earth's magnetic field can also be connected with processes in the mantle. New results show how the rapid processes in the outer core, which flows at rates of up to about one millimeter per second, are coupled with the processes in the mantle, which occur more in the velocity range of centimeters per year. |
| Chronic 2000-04 drought, worst in 800 years, may be the 'new normal' Posted: 29 Jul 2012 11:21 AM PDT The chronic drought that hit western North America from 2000 to 2004 left dying forests and depleted river basins in its wake and was the strongest in 800 years, but those conditions will become the "new normal" for most of the coming century, scientists conclude in a new report. Such climatic extremes, they say, have increased as a result of global warming. |
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