What three cities form the global centers of economic activity?

Distance that the transcontinental railroad covered from Omaha to San Francisco.

Stanley Miller set out to test the hypothesis that the chemicals that Harold Urey proposed were present in Earth's early atmosphere could recombine through chemical reactions to produce organic molecules required for life on this planet.

Why is the desert hot

Which body in the solar system has an orbit so eccentric that it crosses the orbit of neptune?

The largest city in Brazil, Sao Paulo, has a population of about 11 million. Based on the rank-size rule, what is the population of the second-largest city, Rio de Janeiro, most likely to be?

Which process refers to the separation of earth into the core, mantle, and crust

What country in Southeast Asia does not practice Buddhism

If it is 10pm Thursday in Mogadishu Somalia what time and day is it in manila Philippines?

How could von thunen's model be applied at a global scale?

What would happen if the Earth revolves in an opposite direction?