What happens when a super volcano is a threat to Earth

How did the movement of soldiers during world war 1 contribute to the global influenza (flu) pandemic of 1918 to 1919, which killed millions of people

Which of teh following would explain the importance of the trans-siberian railroad to russia's economy? (schoology test)

Which of the following characteristics define a state? check all that apply. a. a population of people b. a sovereign government that determines how a group of people is ruled c. an army, military, or police force d. a territory with set borders