移动中的岩石

不，今天主页图片中的那块石头并不是自己弄到的。还是真的？死亡谷不仅是地球上最热的地方之一，它还拥有一种神秘的地质现象：岩石在异常平坦的沙漠地面上漂移，似乎是在它们自己的力量下形成的。死亡谷赛马场的岩石被称为“帆船石”，大小从几盎司到几百磅不等。从我们的图片中可以看到，这些石头在穿过风景秀丽的干湖床时留下了长长的痕迹。
原文：
No, that stone in today's homepage image didn't get there by itself. Or did it? Not only is Death Valley one of the hottest places on Earth, it also boasts a mysterious geologic phenomenon—rocks that drift across the exceptionally flat desert floor, seemingly under their own power. The rocks here at Death Valley's Racetrack Playa are known as 'sailing stones' and they can vary in size from a few ounces to hundreds of pounds. As seen in our image, the stones leave long trails behind them as they move across the scenic dry lakebed.
《© Patrick Walsh/Getty Images》