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For example, biogas, thermal efficiency, plastics etc. There are four types of natural resources:


                                                             Natural Resources






                           Renewable             Non-Renewable              Exhaustible             Inexhaustible


                 •  Renewable: Resources which occur in abundance and are renewed on their own by our mother nature through
                   the natural process of recycling, replacement, and reproduction are called renewable resources. Some renewable
                   resources are as follows:
                      w Water: Only about 2.5% of the water on earth is fresh water. Energy from rivers is used to make electricity. The
                     energy produced by tides in the sea and oceans can also be converted into electricity.
                      w Sun: Sun's energy can be used to generate electricity. These are used in calculators, street lamps, and even room
                     and water heaters.

                      w Wind: The energy from the force of the wind is wind energy. This energy can be used for work such as grinding
                     grain, pumping water, etc. This energy can also be converted to electricity.
                      w Biomass: Energy can be produced by wastes from plants and animals. It can be used for any heating purpose, such
                     as cooking. It can also be used to produce electricity and heat.
                      w Soil: Nutrients in the soil help plants grow. Soil is used to provide shelter. Soil quality gets damaged due to addition
                     to harmful chemicals, land pollution, construction activities, and cutting down of trees.











                                                           Renewable Resources

                 •  Non-Renewable: Resources that are limited and cannot be replaced at the same speed at which they are used up
                   are called non-renewable resources. It takes millions of years to form inside the earth. For example, fossil fuels,
                   minerals, natural gases, nuclear energy, etc. Non-renewable resources can be called inorganic resources if they
                   come from non living things. Some non-renewable resources are as follows:

                      w Coal: Coal is one of the cheapest sources of fuel. It is used in powerhouses, factories and houses for cooking and
                     heating.
                      w Petroleum: It includes petrol, diesel and mineral oils. It is used to run motor vehicles. furnaces and powerhouses.
                      w LPG: Liquefied petroleum gas (LPG) is made from petroleum gas. LPG is used for cooking and also for running
                     vehicles.
                      w Natural Gas: It is formed by decomposition of dead animals and plants that are buried under lakes and oceans. It
                     is found above the oil in the oil wells. Compressed natural gas (CNG) is used for running vehicles.
                      w Nuclear Plants: Nuclear energy is made available to us with the help of nuclear power plants. Nuclear energy is
                     becoming a common source of electricity throughout the world. It has the danger of causing great harm in case
                     of an accident.




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