The main idea of this paragraph is A
1-The total length of the coastline of India is 7,516.6 km. India shares its border with seven countries namely Afghanistan, Pakistan, China, Bhutan, Nepal, Myanmar, Bangladesh, Maldives and Sri Lanka.
2-The countries that are larger than India are Russia, Canada, U.S.A, China, Brazil and Australia. Russia is the largest among all countries. The area of the Country Russia is of 17.09 sq.km, and India has an area of 3.28 sq.km.
Answer:
That is much less often than in the last 150 million years, when the field has flipped every 600,000 years. In the last 10-20 million years it has sped up even more, to once every 200,000-250,000 years. "The evidence points to a more stable field in the very far past and fewer reversals," says Veikkolainen.
