Individual city-states developed in greece because the country was divided by mountains lakes rivers

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.

What is the approximate chemical composition of the solar nebula?

Select the natural regions. delta denver forest georgia north america plateau stream