Friday, December 28, 2012
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Tuesday, December 25, 2012
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Saturday, December 22, 2012
Walking ROCK
This is Racetrack Playa in Death Valley California. This area has been the centre of scientific controversy for decades. Why? At this location an amazingly large number or rocks and boulders (some weighing up to half a tonne) have been regularly moving across the surface, without any human or animal interference, and they are not just moving a small distance; one travel path was recorded at 880.73 metres!
Some scientists have proposed that the movement is caused by strong winds accompanied by the development of surface ice when temperatures fall. It is hypothesised that the development of ice allows the wind to move the rocks with less difficultly. This hypothesis, however, is commonly refuted. The hypothesis cannot account for rocks starting side by side and moving at different rates and in disparate directions, and sliding rock trails vary in direction and length. Some rocks which start next to each other start out travelling parallel, but one may abruptly change direction to the left, right, or even back the direction it came from. Length also varies because two similarly size and shaped rocks could travel uniform, then one could burst ahead or stop dead in its tracks.
Some scientists have proposed that the movement is caused by strong winds accompanied by the development of surface ice when temperatures fall. It is hypothesised that the development of ice allows the wind to move the rocks with less difficultly. This hypothesis, however, is commonly refuted. The hypothesis cannot account for rocks starting side by side and moving at different rates and in disparate directions, and sliding rock trails vary in direction and length. Some rocks which start next to each other start out travelling parallel, but one may abruptly change direction to the left, right, or even back the direction it came from. Length also varies because two similarly size and shaped rocks could travel uniform, then one could burst ahead or stop dead in its tracks.
Friday, December 21, 2012
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