Mountains
He set mountains upon the earth lest it shift with you.
16:15And He hath cast into the earth firm hills that it quake not with you, and streams and roads that ye may find a way.
31:10He hath created the heavens without supports that ye can see, and hath cast into the earth firm hills, so that it quake not with you; and He hath dispersed therein all kinds of beasts. And We send down water from the sky and We cause (plants) of every goodly kind to grow therein.