(a) What are fossil fuels? Give three examples of fossil fuels.
(b) Describe how fossil fuels were formed.
(c) Explain how, sun is considered to be the ultimate source of fossil fuels.
(d) Which fossil fuels were formed by the buried remains of small plants and animals?
(e) Which fossil fuel formed by the buried remains of large land plants?
(b) Describe how fossil fuels were formed.
(c) Explain how, sun is considered to be the ultimate source of fossil fuels.
(d) Which fossil fuels were formed by the buried remains of small plants and animals?
(e) Which fossil fuel formed by the buried remains of large land plants?
(a) Natural fuels that are found deep inside the earth and are formed from the prehistoric remains of organisms are called fossil fuels. Three examples of fossil fuels are coal, petroleum and natural gas.
(b) Plants and animals that died millions of years ago got buried deep inside the earth and covered by mud and sand. In the absence of oxygen and because of the chemical effects of pressure, heat and bacteria, the remains of the plants and animals were, over the years, converted into fossil fuels, such as coal, petroleum and natural gas. The buried remains of large plants got converted into coal and those of small plants and animals into petroleum and natural gas.
(c) We know that green plants use sunlight for photosynthesis, which is the process by which they produce food for their growth. When animals eat plants for energy, they consume food made with the help of sunlight. When plants and animals die, their remains, which consist of material directly or indirectly made with the help of sunlight, are buried in the earth and converted into fossil fuels, such as coal and petroleum. Hence, the sun is the ultimate source of fossil fuels.
(d) Petroleum and natural gas are formed from the buried remains of small plants and animals.
(e) Coal is formed from the buried remains of large plants.
(a) Natural fuels that are found deep inside the earth and are formed from the prehistoric remains of organisms are called fossil fuels. Three examples of fossil fuels are coal, petroleum and natural gas.
(b) Plants and animals that died millions of years ago got buried deep inside the earth and covered by mud and sand. In the absence of oxygen and because of the chemical effects of pressure, heat and bacteria, the remains of the plants and animals were, over the years, converted into fossil fuels, such as coal, petroleum and natural gas. The buried remains of large plants got converted into coal and those of small plants and animals into petroleum and natural gas.
(c) We know that green plants use sunlight for photosynthesis, which is the process by which they produce food for their growth. When animals eat plants for energy, they consume food made with the help of sunlight. When plants and animals die, their remains, which consist of material directly or indirectly made with the help of sunlight, are buried in the earth and converted into fossil fuels, such as coal and petroleum. Hence, the sun is the ultimate source of fossil fuels.
(d) Petroleum and natural gas are formed from the buried remains of small plants and animals.
(e) Coal is formed from the buried remains of large plants.
