What is a rock that forms when existing rock is changed beneath earth’s surface called?.

In 1915 the german geologist and meteorologist alfred wegener first proposed the theory of continental drift, which states that parts of the earth's crust slowly drift atop a liquid core. the fossil record supports and gives credibility to the theories of continental drift and plate tectonics.

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

Name the two rivers that run through the fertile crescent. how were the rivers both positive and negative to societies of the fertile crescent?