海岸侵蚀威胁着许多建在悬崖上的村庄。

Coastal ___erosion threatens many villages built on the cliffs.

森林砍伐加速了土壤侵蚀并降低了土地肥力。

Deforestation speeds up soil ___erosion and reduces land fertility.

这片古老地貌的侵蚀是一个由风雨历经数世纪造成的缓慢过程。

The ___erosion of the ancient landscape was a slow process caused by wind and rain over centuries.