The third paragraph of the body should contain the weakest argument, weakest example, weakest illustration, or an obvious follow up to the second paragraph in the body. The first sentence of this paragraph should include the reverse hook which ties in with the transitional hook at the end of the second paragraph. The topic for this paragraph should be in the first or second sentence. This topic should relate to the thesis statement in the introductory paragraph. The last sentence in this paragraph should include a transitional concluding hook that signals the reader that this is the final major point being made in this paper. This hook also leads into the last, or concluding, paragraph.
Trees are very important to us for many very practical reasons because of the uses to which the wood can be put. [Topic sentence] However, their value in economic terms is nothing compared to their role in helping to regulate the world's climate and providing fertile soil. [Topic point 1 ] The wholesale destruction of trees is a threat to us all because trees support life. [Specific detail A] A single tree can take up 1000-2000 litres of water from the ground every year, releasing most from the leaves as water vapour. [B] This water vapour is then added to water vapour from other sources to form clouds. [C] It eventually returns to the ground in the form of rain or possibly snow. [D:] This ability to move vast quantities of water vapour from one place to another has a significant effect on the regional climate and on local water table levels. [Topic point 2] Another factor is that the ground in a forest acts like an enormous sponge. [Specific detail A] It absorbs rainwater and holds it within the soil, releasing it gradually back into the atmosphere. [B] Where trees have been cut down, the ground is unable to absorb water so easily and it runs off rapidly causing flooding in other areas. [Topic point 3] A further factor is the degree to which most trees add to the fertility of the soil around them. [Specific detail A] Every year millions upon millions of leaves flutter down and rot into the soil, adding to the richness of the soil base in which other plants can grow. [B] Insects thrive within this rich, damp environment and they are themselves a source of food for other animals up the food chain. [C] All of them are threatened when trees are cut down in large numbers.