true or false 31. Weathering is the process of breaking down rocks into smaller pieces. 32. Erosion is the process in which earthen materials are worn away and transported by natural forces such as wind or water. 33. Contour plowing is the process of replanting an area with trees. 34. Riprapping is planting of crops in a different spot each year. 35. Water, wind, temperature and plants are agents of weathering. 36. Mechanical weathering is the physical wearing away of rock. 37. Digging and quarrying are human activities that can cause the breakdown of rocks. 38. When the temperature drops to O Celsius the rocks expand and causes fracture. 39. Burrowing animals contribute to the weathering of rocks. 40. Rock is the slow end product of weathering process. Frae In​