Question

give reasons for the following

(a) fertile soil has lot of humus.

(b)dust is considered as a pollutant.

(c)people love to fly kites near the sea shore.

Answer 1

Humus is a dark brown coloured organic material that is formed as a result of decomposition of animal and plant material by a large number of microorganism that dwell in the soil environment. Humus is actually partially or wholly decomposed dead and decaying organic matter of animal or plant origin, by the presence of which make a soil nutrient rich and impart it the capability to retain water. All these qualities of soil are essential to increase the fertility of soil
Thus fertile soil is always humus rich.

Dust may be considered as primary pollutant, since it cause pollution by its direct release in the environment. It cause many respiratory diseases or may even worsen some diseases like hay fever and asthma.

Wind may be defined as the bulk movement of air. Atmosphere is often windy near sea shore due to pressure gradient. So it is easy to fly kite near such areas.