Definition of launchpad. : a nonflammable platform from which a rocket, launch vehicle, or guided missile can be launched.
Terrain is defined as the specific physical features of an area of land. An example of terrain is a rocky and jagged coastline. ground or a tract of ground, esp. with regard to its natural or topographical features or fitness for some use.
1 Topography is the shape of the Earth's surface and its physical features. Topography is constantly being reshaped by weathering, erosion, and deposition.  Weathering is the wearing away of rock or soil by wind, water, or any other natural cause.