OBJECTIVE FORESTRY

Detailed explanation-1: -It is primarily composed of nutrients, minerals, water, and other inorganic particles like metal ions, and some decaying residues of plants and animals. Soil is formed by the rigorous degradation of huge rocks into finer particles like gravel and this process goes on to finally produce clay.

Detailed explanation-2: -Soil is formed from weathered rocks which have gravel, fine and coarse sand, silt and clay. The largest particle is gravel, and the smallest one is clay.

Detailed explanation-3: -Mineral soil particles come from rock and sediments. The coarser materials are usually fragments of the original materials, while the finer materials (commonly clay) are usually the product of considerable weathering.

Detailed explanation-4: -Big rocks are broken into small pieces over time with the effect of wind, sun and water. This process is called weathering. Gradual wearing away or washing away of top layer of soil is called soil erosion. Physical forces of wind and water are primary causes of soil erosion.