Explanation: Rocks of Same Age Across the Oceans:

• The radiometric dating methods developed in the recent period have facilitated correlating the rock formation from different continents across the vast ocean.
• The belt of ancient rocks of 2,000 million years from Brazil coast matches with those from western Africa.
• The earliest marine deposits along the coastline of South America and Africa are of the Jurassic age.
• This suggests that the ocean did not exist prior to that time.

Source: NCERT Class 11