然而，使所有的黑土形成冰川作用的问题是，在前寒武纪沉积物中广泛分布有黑土。
The problem with ascribing all tillites to glaciation, however, is that tillite deposits are widespread in Precambrian sediments.
重力不断的向下托拽山坡，当重力作用超过岩石、沙子和沉积物的强度，就形成滑坡，并使得地面开始沿着山坡滑落。
Gravity constantly tugs downward on a slope, but only when gravity's force exceeds the strength of the rocks, soils, and sediments composing the slope does land begin to slide down hill.
红、赭、粉等颜色来自三叠纪干燥期缓慢形成的沉积物，在足够长的时间里，侵蚀与氧化作用创造出这种奇迹。
The reds, ochres and pinks hail from the much slower deposition during the Triassic's dryer periods, when erosion and oxidation had time to work their magic.
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