Which set of proccesing must occur to form soil
1. weathering breaks rocks into minerals and plants die and decay
2. plants produce loam and plants produce humus
3. erosion and weathering
4. erosion transport mineral particles and plants die and decay

Option (3)

Explanation:

The soil is the most essential element that is beneficial for the growth of plants. They are formed by both weathering and erosion. The process by which the rocks are broken down is known as the weathering process. This occurs both by physical as well as chemical means. The factors that are responsible for the weathering of rocks are temperature, pressure, gravity, Water, Wind, living creatures. These broken rock fragments are further transported from one place to another by the agents such as wind, water and ice are known as erosion. This finer broken fragments after deposition give rise to the formation of soil.

Thus, the weathering and erosion of rocks are the set of processes that results in soil formation.

Hence, the correct answer is option (3).