What was considered to be the starting point of the Space Race between the Soviet Union
and the U. S.?

Ahill is made of rock particles of different sizes. which of these agents of erosion probably caused the hill to form?

There are 4 red balls, 6 white balls, and 3 green balls in a bag. if one ball is drawn from the bag at random, what is the probability that it is not white?

What are some of the impacts of humans on the earth?