Q61. What are the advantages and disadvantages of crude oil?

 

Q62. What are the advantages and disadvantages of coal?

 

Q63. What are the advantages of biogas over natural gas?

 

Q64. How can quarrying become a major environmental concern?

 

Q65. What are the advantages and disadvantages of natural gas?

 

Q66. What are the common uses of minerals?

Or

List uses of any three minerals.

 

Q67. Write a short note on distribution of minerals in South America.

 

Q68. What are the advantages and disadvantages of hydel power?

 

Q69. What has led to the tapping of various non-conventional source of energy?

Or

Why is there a need for harnessing non-conventional sources of energy?


Last modified: Sunday, 28 April 2019, 6:07 PM