新鲜岩石指未经风化的岩石。风化作用对岩石的破坏，首先是从地表开始，逐渐向地壳内部深入。在正常情况下，愈接近地表的岩石，风化得愈剧烈，向深处便逐渐减弱，直至过渡到不受风化，这些不受风化岩石就是所谓的新鲜岩石。
它的表面大部分是在过去十亿年里形成的，使得它比地球以外的任何岩石行星都更新鲜活跃。
The surface formed mostly in the last billion years, which makes it fresher and more recently active than any rocky planet other than earth.
河谷天然岸坡通常由坡面向内有一个强卸荷带和弱卸荷带以及相应的强风化和弱风化带，内侧则为完整新鲜的岩石。
Natural slope usually has a zestier of strong unloading and a zestier of weak unloading and corresponding zone of strong (or weak) weathering, and there is integrity fresh rock in its inside.
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