Lakhmir Singh For Class 9 Biology Chapter 6 Natural Resources - Download Free PDF with Solution
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FAQs on Lakhmir Singh Solutions for Class 9 Biology Chapter 6 Natural Resources - PDF
1. What is air?
The natural mixture of gases present in the atmosphere is called the air. It contains nitrogen, oxygen, water vapour and carbon dioxide.
2. What is the water cycle?
The cycle where water evaporates from different sources forms clouds, precipitates and goes back to the same sources is called the water cycle.
3. Why the temperature on earth is fairly steady?
Due to the blanketing of the atmosphere, heat is entrapped, thus, causing a fair steady temperature on the earth’s surface.
4. What is air pollution?
The presence of contaminants and harmful gases in the air is called air pollution. It can be manmade or natural.
5. What is acid rain?
The higher concentration of acidic oxides released from industries causes acid rain. The pH level of the rainwater falls in the acidic range.