Explanation:

Landforms mean mountains, hills, plateaus, plains etc. Depending on the type and structure of the crustal materail, landform in that area will vary. Similarly, the differences in the land forming processes will give rise to different types of landforms. The third statement – differential rates of the processes at different places on the Earth’s surface is also correct. If erosion is taking at a higher rate in an area than the deposition or upliftment, then that area will tend to have plains. On the other hand if upliftment is high, then hills and mountains landforms will be found.