七大自然奇迹现象 7 Phenomenal Wonders

7 Phenomenal Wonders of the Natural World
全球七大自然奇迹现象

地球许多奇异古怪的自然现象不仅转眼即逝，而且许多奇迹般的自然现象都发生在人类难以抵达的地区。目前，美国媒体列举了全球7大“自然奇迹现象”

The classical natural wonders are huge and hard to miss - vast canyons, giant mountains and the like. Many of the most fantastic natural phenomena, however, are also least easy to spot. Some are incredibly rare while others are located in hard-to-reach parts of the planet. From moving rocks to mammatus clouds and red tides to fire rainbows, here are seven of the most spectacular phenomenal wonders of the natural world.

1、会漂移的石头 Sailing Stones




会漂移的石头

　　在美国死亡谷有一种奇特的现象，神秘的石头会在充满泥泞的荒滩沙漠上“漂移”，这一现象在科学界已争辩了数十年。数百磅重的石头也能够漂移至数百米远，许多科学家认为这可能是强风和沙漠表面的冰层结合作用下促进石头出现移动。然而，这种解释并站不住脚，它无法解释为什么不同大小的石头会并排以不同速率和截然不同的方向移动。此外，物理学计算也不支持以上的解释，这需要至少数百英里每小时的风速才能将沙漠上的石头移动，也许强烈的风会吹到一些小石块，但数百磅重的石块是通过什么神秘力量移动的呢？

The mysterious moving stones of the packed-mud desert of Death Valley have been a center of scientific controversy for decades. Rocks weighing up to hundreds of pounds have been known to move up to hundreds of yards at a time. Some scientists have proposed that a combination of strong winds and surface ice account for these movements. However, this theory does not explain evidence of different rocks starting side by side and moving at different rates and in disparate directions. Moreover, the physics calculations do not fully support this theory as wind speeds of hundreds of miles per hour would be needed to move some of the stones.