3. how would you distinguish, on the basis of minerals present, among
granite, gabbro, and diorite?

botswana

explanation:

the kalahari desert covers much of the southern half of the country, botswana.

this is from the test:

if he does not use open the compass the a width greater than half of po, he will not be able to find the midpoint of the line, without the midpoint of the line, he will not be able to bisect the line.   to find the midpoint of a line the circles drawn with a compass must either intersect or be touching.