Land surface is a term used to describe the physical outer layer of the earth's crust. It includes all the natural features on the surface like mountains, hills, valleys, plateaus, and plains. Over time, geologists and geographers have coined different synonyms to describe this foundational aspect of the earth's terrain. Geometrically, land surface can be called topography, whereas the features on the surface can be labeled relief, terrain, or landscape. On a larger scale of discussion, this aspect can be referred to as Earth's crust, and on a smaller scale of description, it can be identified as ground, floor, or surface. In all, these synonyms effectively capture this fundamental aspect of the earth's topographical characteristics.