C. The major river valleys of mainland Southeast Asia are sparsely populated.
The correct answer is B. Southern Africa and Russia.
These two parts of the world are the most abundant when it comes to diamond resources, and they export a large part of it in order to get profit. Countries such as Botswana and the Democratic Republic of Congo in Southern Africa are some of the places where you can find a lot of diamonds, apart from Russia.
I believe your answer would be
A. increase
I hope that helps u!
According to the Hubble law the more distant galaxies, the greater apparent recessional velocity. The Hubble law states that as the distance to galaxies increases, the apparent recessional velocity increases. The main equation is: <span>Recessional Velocity = </span>Hubble's constant<span> times distance</span><span>.</span>