<span>The best and most correct answer among the choices provided by the question is the fourth choice "reaching the mantle caused by the movement of two tectonic plates away from each other"</span><span>
The Gakkel Ridge is a mid-oceanic ridge, a divergent tectonic plate boundary between the North American Plate and the Eurasian Plate. It is located in the Arctic Ocean between Greenland and Siberia, and has a length of about 1,800 kilometers.
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Q2. Indians and Africans were considered black. Some Americans were even considered black too.
This is called species richness
