Weathering is the first step in the process of soil formation.
Read the following statements with reference to the soil.
i) Weathering is a very fast process of soil formation.
ii) Percolation of water is faster in sandy soils.
iii) Loamy soil contains only sand and clay.
iv) Topsoil contains the maximum amount of humus.
Choose the correct statements from the above.
Where does the first step in the process of urine formation occur?