1, the surface of washed stone is smoother than that of Fengfeng fossil after a long time of washing.
2. Wind fossils are the wind and the sun, blowing stones a little soft, not as hard as stones in water.
3. The stone in water has strong plasticity, can be used for carving and is not easy to break. The wind fossils on the top of the mountain are generally used for buildings, and the internal structure is loose and cannot be formed.