Describe how coal is formed from dead vegetation. What is this process called?
Solution and Explanation
About 300 million years ago the earth had dense forests in low lying wetland areas. Due to natural processes, like flooding, these forests got buried under the soil. As more soil deposited over them, they were compressed. The temperature also rose as they sank deeper and deeper. Under high pressure and high temperature, dead plants got slowly converted to coal.
As coal contains mainly carbon, the slow process of conversion of dead vegetation into coal is called carbonisation.
Top Questions on Coal
- Arrange the coal types from lowest to highest rank?
(A) Brown coal
(B) Sub bituminous
(C) Hard coal
(D) Soft coal
Choose the correct answer from the options given below: - The Gondwana coals formed during-
- Arrange the coal types from highest to lowest rank as per their Carbon content.
A. Lignite
B. Sub bitumenous
C. Anthracite
D. Bitumenous
E. Peat
Choose the correct answer from the options given below : - Describe characteristics and uses of coke.
- Tick True/False against the following statements.
- Fossil fuels can be made in the laboratory. (T/F)
- CNG is more polluting fuel than petrol. (T/F)
- Coke is almost pure form of carbon. (T/F)
- Coal tar is a mixture of various substances. (T/F)
- Kerosene is not a fossil fuel. (T/F)
Questions Asked in CBSE Class VIII exam
- For each of the following numbers, find the smallest whole number by which it should be multiplied so as to get a perfect square number. Also find the square root of the square number so obtained.
- 252
- 180
- 1008
- 2028
- 1458
- 768
- CBSE Class VIII
- Square Roots
Say whether the following are true or false.
1. Ignesious lost his wife, two children, his father-in-law, and his brother-in-law in the tsunami.
2. Sanjeev made it to safety after the tsunami.
3. Meghna was saved by a relief helicopter.
4. Almas’s father realised that a tsunami was going to hit the island.
5. Her mother and aunts were washed away with the tree that they were holding on to.
- CBSE Class VIII
- The Tsunami
Fill in the blanks using the correct form of the verbs in brackets.
My little sister is very naughty. When she ____ (come) back from school yesterday, she had _____(tear) her dress. We _____(ask) her how it had _____(happen). She ______(say) she _____ _____ (have, quarrel) with a boy. She _____ _____ (have, beat) him in a race and he _____ ____ (have, try) to push her. She _____ ____ (have, tell) the teacher and so he _____ _____ (have, chase) her, and she _____ _____ (have, fall) down and _____ _____ (have, tear) her dress.
- CBSE Class VIII
- The Best Christmas Present in the world
- Consider the following parallelograms. Find the values of the unknowns \(x, y, z\).
- CBSE Class VIII
- Kinds of Quadrilaterals
- In the tsunami 150,000 people died. How many animals died?
- CBSE Class VIII
- The Tsunami