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.
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。
When they fall over, they slide a long way down the hill!
当他们落下时，就会沿着山坡滑行很长的一段路。
When they fall over, they slide a long way down the hill!
当他们落下时，就会沿着山坡滑行很长的一段路。
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