The Volga river is the largest river in Europe, so that should be the answer.
Answer:
The answer is a) oil
Explanation:
Oil, especially in these areas, are abundant. In the past, these areas became wealthy because of oil.
I guess the answer to the blank will be:
During the second Red Scare public and government suspicious of Communism led to the blacklisting of people in various industries.
Answer:
One way that glaciers change the landscape is by erosion. As they pass over the ground, the ice scrapes up soil and rock. A valley glacier will leave a valley much deeper, as it erodes the underlying surface with plucking and abrasion.
U mean cites ? in the phrase of densely populated area ?