The oceanic crust lies beneath the ocean floor and has a thickness of five to twelve kilometers. On the upper surface, there is a thin layer of unconsolidated sediment that rests on the basement layer composed of basalt. 洋壳位于海洋底板之下，其厚度在5至12公里之间，其表面为薄薄的一层未固结的沉积物，沉积物覆盖于由玄武岩组成的基底岩层之上。
"There was at least five inches of this gray, pasty, dusty drywall soot on the ground as well as a thickness of it in the air." 地面上足足有五英寸厚的墙灰,灰色的、糊状的灰尘,在空气中也有这么厚的一层。
Our coating has a thickness of 0.7 to 1 micrometer. 我们的涂层只有0.
There is a clearance of only five inches. 只有五寸的间隙。