Environment is a place where different things are such as a swampy or hot environment. It can be living (biotic) or non-living (abiotic) things. It includes physical, chemical and other natural forces. Living things live in their environment. They constantly interact with it and adapt themselves to conditions in their environment. In the environment there are different interactions between animals, plants, soil, water, and other living and non-living things. Since everything is part of the environment of something else, the word environment is used to talk about many things. Thus, Environment includes the living and non-living things that an organism interacts with or has an effect on it. Living elements that an organism interacts with, are known as biotic elements: animals, plants, etc., abiotic elements are non-living things which include air, water, sunlight etc. Studying the environment means studying the relationships among these various things. An example of interactions between non-living and living things is plants getting their minerals from the soil and making food using sunlight. Predation, an organism eating another, is an example of interaction between living things. Things in the natural environment are called natural resources. These are renewable resources because they come back naturally when we use them. Non-renewable resources are important things in the environment that are limited for example, ores and fossil fuels. Some things in the natural environment can kill people, such as lightning. • Ecological units which are natural systems without much human interference. These include all vegetation, microorganisms, soil, rocks, atmosphere, and natural events. • Universal natural resources and physical phenomenon which lack clear-cut boundaries. These include climate, air, water, energy, radiation, electric charge, and magnetism.