Original: This is thought to result from the sublimation-driven degradation of small landforms, which is supported by the general deficit of small impact craters and the presence of numerous small knobs, considered to be their remnants.
Simplified: This is thought to result from the degradation of small landforms, caused through sublimation, which is supported by the general lack of small impact craters and the presence of numerous small knobs, considered to be their remains.