“Nature has the power to refresh and renew”- Helen Keller
Several environmental issues such as pollution, global warming, ozone layer depletion, acid rain, deforestation, land slide, drought and desertification have gained major focus across the world. Environmental science provides holistic knowledge about natural processes, effects of human intervention and solutions to overcome such environmental issues. Thus, it is defined as the study of patterns, processes in the natural world and their modifications by human activities. Elements of nature continuously undergo changes and transformations. They are recycled over and over again on earth and make themselves always available on earth. In the same way, all living organisms react with their environment and develop certain morphological, anatomical, physiological and reproductive features to withstand particular conditions. This lesson deals with biogeochemical cycles, adaptations by the plants and animals, water conservation and recycling of water.