在这堆岩层的上面，一些沙子沉积、掩埋、固化成岩，然后又被带回到表面上。
On top of this mess, some sand was deposited, buried, lithified into rock, and brought back up to the surface yet again.
脚下的地面铺了沙子般的粗糙，好像岩尘不怎么舒服。
The ground under their feet gritted harshly, like lava-dust.
相对于菜园土、蛭石和沙子(1：1)、沙子、草炭与珍珠岩(1：1)而言，蛭石是最佳移栽基质。
Compared with other matrixes, such as soil, vermiculite VS sand (1:1), peat VS pearlite (1:1), vermiculite was the best. Meanwhile, shade and intermittent mist are also necessary.
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