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If extensive leaching of a saline-sodic soil occurs in the absence of any source of calcium or magnesium, part of the exchangeable sodium is gradually replaced by hydrogen. Such soil may be slightly acidic in nature, yet it may contain enough sodium to give it an unstable structure. Such a soil is designated as a degraded sodic soil, earlier known as degraded alkali soil.
Which of the following is the highest peak in the world?
Mount Kosciuszko is located in which country?
What percent of the earth’s surface is covered by the Atlantic Ocean?
Which of the following countries border does not touch China?
In which of the following region midnight Sun is visible?
Consider the following events in the geological history of India:
1. Formation of Gondwana coal
2. Formation of Himalayas
3....
The waves generated by an earthquake are called ________.
Which direction does the Nile River flow?
In which part of India is Dandakaranaya situated?
A cyclone is known by different names in different parts of the world. It is called a ‘________________’ in Japan and Philippines.
