Two million years of stream erosion went on to create two rugged coastal valleys, and a series of ice ages left the slopes covered with pine forests.
两百万年的河流冲蚀形成了两个高低起伏的海岸山谷，而一系列的冰川时代使山坡覆盖上松林。
The primary inducing factors of sand-sliding are surface water, ground water, stream erosion, dynamic load action, wind load action, freezing-and-thawing action, plant and man-made factors.
溜砂的主要诱发因素是地表水、地下水、河流冲刷、动荷载作用、风荷载作用、冻融作用、植物及人为因素。
This "no-till" form of agriculture minimises soil erosion, but it then also sets the stage for corn byproducts to enter nearby stream channels.
这种“免耕”的农业形式最大限度地减少土壤流失，但它随后还是把玉米副产品的后续影响转嫁给了附近的河道。
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