地理科問題...請地理高手幫幫手!! (15pt)

Terrain, or relief(地形), is the third or vertical dimension of land surface. When relief is described underwater, the term bathymetry is used. Topography (地形學)has recently become an additional synonym, though in many parts of the world it retains its original more general meaning of description of place.

Terrain is used as a general term in physical geography, referring to the lie of the land. This is usually expressed in terms of the elevation, slope, and orientation of terrain features. Terrain affects surface water flow and distribution. Over a large area, it can affect weather and climate patterns.

好似 relief map 就是解作「地形圖」。

gradient (坡度) = 垂直比例/水平比例

I also can learn and know something more from it.