I believe that the answer is 7
The four spheres of the Earth includes the Geosphere, Hydrosphere, Biosphere and Atmosphere. The sphere that there is interaction in runoff from farming into the local areas is on Hydrosphere. Hydrosphere <span>is the liquid water component of the Earth. It includes the oceans, seas, lakes, ponds, rivers and streams.</span>
Monsoon is known as unifying bond because of the following reasons:
1) The peninsular plateau, under influence of the sea from three sides, has moderate temperatures.
2) The effect of monsoon on the Indian subcontinent is quite perceptible. The seasonal alteration of the wind systems and the associated weather conditions provide a rhythmic cycle of seasons.
3) The people of India especially the farmer from north to south and from east to west, eagerly await the arrival of the monsoon. These monsoon winds bind the whole country by providing water to set agricultural activities in motion. The river valleys which carry this water also unite as a single river valley unit.
