I dont know if any of you guys know this but you can imitate moving land by using water. In f11 f3 look for/Spawn a water datablock. Change the water textures to a terrain textures. Change the following variables to this
envMapIntensity = "0.4";
TessSurface = "50";
TessShore = "60";
SurfaceParallax = "1";
FlowAngle = "90";
FlowRate = "0.3";
DistortGridScale = "0.1";
DistortMag = "0";
DistortTime = "1";
You can modefy the Flowrate to change the speed of the terrain. You can also change the Wave magnitude to make it look like your passing hills
Last step Spawn a /data/interiors/slate.dif slightly above the water.
Have Fun! (Dont get dizzy)