9.Name two naturally occuring radioactive elements. …

CBSE, JEE, NEET, CUET

Question Bank, Mock Tests, Exam Papers

NCERT Solutions, Sample Papers, Notes, Videos

9.Name two naturally occuring radioactive elements. 10. Name one ore of Aluminium. 11.Which is the most abundantly available fossil fuel in India? 12.What are the ways to conserve minerals? 13.How are minerals classified on the basis of their origin/ composition?

Posted by Parveen Kumari 5 years, 7 months ago

CBSE > Class 08 > Social Science

1 answers

Meghna Thapar 5 years, 5 months ago

Long-lived radioactive elements such as uranium, thorium and potassium and any of their decay products, such as radium and radon are examples of NORM. These elements have always been present in the Earth's crust and atmosphere, and are concentrated in some places, such as uranium orebodies which may be mined.
Bauxite, a major aluminium ore. The red-brown colour is due to the presence of iron oxide minerals.
Coal is the most abundantly found fossil fuel in India. Its three major forms are Anthracite, Bituminous and Lignite.
Measures to conserve minerals :

Use of minerals in a planned and sustainable manner.
Recycling of metals.
Use of alternative renewable substitutes.
Technology should be improved to use the low-grade ores profitably.

Minerals are classified on the basis of their chemical composition, which is expressed in their physical properties. This module, the second in a series on minerals, describes the physical properties that are commonly used to identify minerals. These include color, crystal form, hardness, density, luster, and cleavage.

0Thank You

ANSWER