贫瘠的土地上首先长满了地衣这种低等植物，它们在裸露的岩石上生存。
First to colonize the barren land are the lowly lichens, surviving on bare rock.
裸露的岩石受到各种天气过程的侵蚀，逐渐分解成碎片，然后被带走，最后沉积形成沉积物。
The exposed rocks are attacked by the various weather processes and gradually broken down into fragments, which are then carried away and later deposited as sediments.
它携带着细小的沙粒，这些沙粒会轰击裸露的岩石表面，从而把岩石磨成更多的沙子。
It carries fine particles of sand, which bombard exposed rock surfaces, thereby wearing them into yet more sand.
它携带着细小的沙粒，这些沙粒会轰击裸露的岩石表面，从而把岩石磨成更多的沙子。
It carries fine particles of sand, which bombard exposed rock surfaces, thereby wearing them into yet more sand.
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