The amount of water in the ocean would have formed the equivalent of a 1, 800 footlayer spread out over the entire planet.
如果将海洋所含总水量在火星表面铺展开,相当于给其表面铺了一层厚达1800英尺的水层。
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Nowadays, a great rail-mounted combine chews away at a 10-foot-thick layer of salt in the old seabed, before it is towed 11 miles back to the plant, and washed and ground.
Around the same time, a massive volcanic eruption in the Wrangell Mountains in Alaska occurred, blanketing the area in a layer of ash, up to a foot deep, called the White River tephra.