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Author Topic: Sailing Stones  (Read 888 times)

taga tigbao

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Sailing Stones
« on: July 15, 2013, 04:57:29 PM »
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taga tigbao

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Re: Sailing Stones
« Reply #1 on: July 15, 2013, 04:58:27 PM »
Sailing stones, sliding rocks, and moving rocks all refer to a geological phenomenon where rocks move and inscribe long tracks along a smooth valley floor without human or animal intervention. Tracks from these sliding rocks have been observed and studied in various locations, including Little Bonnie Claire Playa in Nevada,[1] and most notably Racetrack Playa, Death Valley National Park, California where the number and length of tracks are notable. At Racetrack Playa, these tracks have been studied since the early 1900s, yet the origins of stone movement are not confirmed[2] and remain the subject of research for which several hypotheses[3] exist.

The stones move only every two or three years and most tracks develop over three or four years. Stones with rough bottoms leave straight striated tracks while those with smooth bottoms tend to wander. Stones sometimes turn over, exposing another edge to the ground and leaving a different track in the stone's wake.

Trails differ in both direction and length. Rocks that start next to each other may travel parallel for a time, before one abruptly changes direction to the left, right, or even back to the direction from which it came. Trail length also varies – two similarly sized and shaped rocks may travel uniformly, then one could move ahead or stop in its track. - Wiki
SALVE REGINA, MADRE DI MISERICORDIA.
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taga tigbao

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Re: Sailing Stones
« Reply #2 on: July 15, 2013, 05:02:10 PM »
SALVE REGINA, MADRE DI MISERICORDIA.
VITA, DOLCEZZA, SPERANZA NOSTRA,
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islander

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Re: Sailing Stones
« Reply #3 on: July 15, 2013, 06:40:06 PM »
very interesting.  your planet earth is truly awesome, bai tigs.  so many surprises...
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

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Re: Sailing Stones
« Reply #4 on: July 15, 2013, 07:08:54 PM »

DEATH Valley sand dunes

islander

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Re: Sailing Stones
« Reply #5 on: September 17, 2015, 07:07:29 PM »

Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

islander

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Re: Sailing Stones
« Reply #6 on: September 17, 2015, 07:09:00 PM »

Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

islander

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Re: Sailing Stones
« Reply #7 on: September 17, 2015, 07:10:38 PM »

Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

islander

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Re: Sailing Stones
« Reply #8 on: September 17, 2015, 07:27:55 PM »

(...)

Several theories have been proposed to explain this curious phenomenon, including some sort of localized, unknown magnetic effect. This theory has been discounted for a variety of reasons including that many of the stones do not contain significant amounts of magnetic elements such as iron, and that the stones should gradually assemble in one place — which they don't. Some have suggested that the strong winds that blow through the area might move the rocks after the lakebed has become slick.

Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

islander

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Re: Sailing Stones
« Reply #9 on: September 17, 2015, 07:44:59 PM »

The most likely solution to the mystery involves a combination of wind, temperature and water. Although Racetrack Playa is a dry lakebed, it is not always dry; in fact, water collects on the surface after rainfall or when snow from surrounding peaks melts. Brian Dunning, a California researcher who discussed this mystery on his Skeptoid podcast, notes that when water is present and the temperature falls below freezing — as it sometimes does — a thin sheet of ice is created: "Solid ice, moving with the surface of the lake and with the inertia of a whole surrounding ice sheet, would have no trouble pushing a rock along the slick muddy floor... As the wind shifts and the flow ebbs, these ice floes drag the rocks across the slippery mud surface in zig-zagging paths, even moving heavy rocks and sometimes dragging some but washing past others nearby."


On the playa
Credit: Richard Norris
Biologist Richard Norris stands next to a Racetrack Playa rock trail that may have formed in the late 1990s.

NASA researcher Ralph Lorenz became intrigued by the enigmatic stones while studying Death Valley weather conditions. He developed a tabletop experiment to show how the rocks might glide across the surface of the lakebed.
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

islander

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Re: Sailing Stones
« Reply #10 on: September 17, 2015, 07:45:55 PM »

"I took a small rock and put it in a piece of Tupperware, and filled it with water so there was an inch of water with a bit of the rock sticking out," Lorenz told Smithsonian.com.

After putting the container in the freezer, Lorenz ended up with a small slab of ice with a rock embedded in it. By placing the ice-bound rock in a large tray of water with sand at the bottom, all he had to do was gently blow on the rock to get it to move across the water. And as the ice-embedded rock moved, it scraped a trail in the sand at the tray's bottom.
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

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Re: Sailing Stones
« Reply #11 on: September 17, 2015, 07:48:04 PM »

Shy stones

Though such explanations are plausible, they were very difficult to prove since no one had actually seen or recorded the stones' movements. Understandably, no one has volunteered to spend every minute of their lives — day and night for several years — enduring temperatures that can reach well above 100 degrees F (37 C), hoping to see a stone move. Furthermore, Racetrack Playa is almost three miles long and over a mile wide (4.8 by 1.6 kilometers). A person of course can't be everywhere at once, and would have to pick one or two rocks to closely and continually monitor just in case they happen to suddenly move. And can you imagine the frustration if someone spent two years watching a non-moving rock, only to later learn that several other rocks on another part of the lakebed had moved while they weren't watching?


New tracks
Credit: Jim Norris
Parallel trails carved in the wet playa mud.
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

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Re: Sailing Stones
« Reply #12 on: September 17, 2015, 07:48:53 PM »

Fortunately, the technology exists to investigate the mystery remotely. In 2013, a team of scientists using rocks with motion-activated GPS units and time-lapse photography captured the first video footage of the stones creeping across the desert floor.  [Related: High-Tech Sleuthing Cracks Mystery of Death Valley's Moving Rocks]


Look closely
Credit: Jim Norris
The rock on the left side of the photograph is about to move, bulldozed by ice.

It turns out that jagged plates of thin ice, resembling panels of broken glass, bulldoze the rocks across the flooded playa. Driven by gentle winds, the rocks seem to hydroplane atop the fluffy, wet mud. The scientists revealed their findings in the Aug. 27 issue of the journal PLOS One.
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

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Re: Sailing Stones
« Reply #13 on: September 17, 2015, 07:49:15 PM »

The mystery has not been solved completely, however. The video shows how smaller rocks move, but no one has ever seen the gigantic playa boulders budge an inch. Another process may be at work on the biggest rocks, according to Jim Norris, an engineer and member of the team.



"I know there are people who like the mystery of it and will probably be somewhat disappointed that we've solved it," Norris said. "It's a fascinating process, and in many ways I hope that there's more to be discovered. Never say never."

Benjamin Radford, M.Ed., is Deputy Editor of Skeptical Inquirer science magazine and author of seven books including Scientific Paranormal Investigation: How to Solve Unexplained Mysteries. His website is www.BenjaminRadford.com.

http://www.livescience.com/
Republic Act 8485 (Animal Welfare Act of 1998, Philippines), as amended and strengthened by House  Bill 6893 of 2013--- violation means a maximum of P250,000 fine with a corresponding three-year jail term and a minimum of P30,000 fine and six months imprisonment

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