Grade 4 | Science | Unit 3 - Concept 2 - Lesson 2 - Types Of Fuel скачать в хорошем качестве

Grade 4 | Science | Unit 3 - Concept 2 - Lesson 2 - Types Of Fuel

Welcome dear students! Types of fuel Types of fuel can be classified into: 1. Biofuels 2. Fossil fuels 1. Biofuels Biofuels: They are fuels made from living organisms that can be planted (such as plants). Examples: • Wood is the oldest fuel that is still used all around the world. • Charcoal is made from wood and it is an important fuel. • Some types of plants such as grass, corn and wood chips can be used to make a liquid biofuel. • Biofuels are renewable fuels which means that they can be continually renewed as plants grow. • Although biofuels are renewable energy resources, they should be conserved, where: 1) Using wood as fuel requires cutting down trees. 2) Cutting down trees at a faster rate than they can grow leads to "deforestation", which has negative effects on the environment. 3) Therefore, we should conserve using wood, so that it will not run out. Note: Many trees grow a few centimeters each year, while some trees reach their full height in a period nearly equals the human's lifetime. This means that the growth of these trees takes more than one human's lifetime to complete their growth. 2)Fossil fuels Fossil fuels: They are fuels formed from the remains of plants and animals that were buried and decomposed over a very long period of time. Examples: • Oil and natural gas were formed from the decomposition of the remains of ancient sea animals. Note: Gasoline is a liquid fuel made from oil. • Coal was formed from the decomposition of the remains of ancient plants. Fossil fuels are nonrenewable fuels which means that they are gone and cannot be easily renewed. Formation of coal: 1) Millions of years ago, large areas of the Earth were covered in swamps, with a lot of plants growing nearby. 2) When those plants died, their remains were decomposed and covered by hundreds of meters of mud and rocks. 3) Due to the effect of the Earth's heat and pressure, those remains were turned into coal. • Fossil fuels (coal, oil and natural gas) take millions of years to be formed, so they are used faster than they are formed. Note: The original source of energy in biofuels and fossil fuels is the light energy of the Sun (solar energy). Oil and Water Oil and water are two types of resources that humans can use to generate energy. Formation of oil: Oil comes from deep in the ground, where oil formed from the decomposition of sea creatures, as follows: 1. When the sea creatures died, their remains settled on the ocean floor. 2. Over millions of years, layers of sediments and rocks covered the remains of those sea creatures. These layers pressed down causing extreme heat and pressure. 3. Over time, as a result of extreme heat and pressure, those remains converted into oil. Oil • Oil is a nonrenewable energy resource. • Nonrenewable resource: It is a natural material that is used faster than it can be renewed (replaced). • Conservation of oil: Oil is used at a rate faster than the formation of new oil, so it should be conserved by many ways such as: • Reducing the use of private vehicles. • Using of public means of transportation. Water • Water is a renewable energy resource. • Renewable resource: It is a natural material that can be renewed (replaced) soon after it is used. • Conservation of water: Water may not be replaced as quickly as we need it, so people should use water carefully to conserve it by many ways such as: • Avoid wasting or polluting water. • Growing plants that do not need large amounts of water for irrigation. #Biofuels #Fossil_fuels #Formation_of_coal #Science_Grade4 #Formation_of_oil #mrraoufashraf Mr. Raouf Ashraf