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.
The term topography implies the study of numerous landforms that exist on or below the earth. Ocean floor topography refers to the different forms in which the ocean floor bottom can exist.