Without sunlight there could be no form of life as we know it and all man's basic needs can be ultimately traced back to the sun. In the first place, by its light and warmth the sun directly creates the necessary conditions for man's survival. Secondly, the sun indirectly provides man with water, for the heat of the sun causes the damp air over the seas to rise and form clouds, which cool at a high altitude and consequently fall as rain. One result of rainfall is the formation of lakes and rivers, from which man takes his water supply and which can be used for hydroelectric power. At the same time, rain, together with sunlight, enables plants to grow, and plants provide food for man and also for animals, which are themselves another source of food for man.

[from Anita Debska : Upgrade your English, Oxford University Press.] 

Question: In Example 5, the paragraph has been developed by stating the cause and the effect. By filling in the-gaps below, you will be able to understand the organization of the paragraph. 

Main Cause : the sun

Main Effect : Man’s …………………..(i)…………………..

Indirect effect   : Rainfall 

…..(ii)……….   : Rainfall

Effect : formation of …………... (iii)……………and ………(iv) ......

Cause : lakes and rivers 

………..(v)….   : water and …………………(vi)…………………

Cause : rain+ …………(vii)………………………………

Effect : plants ……….........(viii)…………………………

......(ix).             : ……………………………(x)……………………

Effect                : ……………(xi)……for man and ……………….xii ..............