Hints: Rice Iceland Earth Mars frozen 因音频缺失，本段最后一个词是 direction

Rice had seen the same thing in Iceland, one of the few places on Earth with similarities to Mars. It too is extremely cold, and most of the water is frozen into glaciers. And also like Mars, buried underground, are massive volcanoes. This powerful combination has shaped the entire landscape. When a volcano erupts, lakes of steaming melt water form high up on top of the glacier until the enormous weight of water forces its way down, bursting out from the base of the glacier. These are the biggest floods on Earth, a surging wall of water stretching for kilometers. In their wake they leave vast planes littered with boulders. To a geologist these boulder fields contain unmistakable evidence of the floodwaters that ripped through here.
Okay, well this is really a classic textbook example, these two large boulders here. The size of them indicates this was an enormous flood that deposited these features, but also if you look at their geometry, these boulders are kind of dipping back in this direction.

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