What part of the sun lies directly above the visible surface?

Write the theory of origin of solar system based on milky way galaxy?

How is energy converted in a hydroelectric plant?

True or False. An ecoregion is defined as a large area of land or water that contains a geographically distinct assemblage of natural communities.

Why is it colder in siberia in winter than at the north pole?

What two methods are used to determine the age of a rock or fossil?

Dams are often built to generate power. One negative impact of damming a river is reduced flow downstream water storage to battle a drought increased recreation opportunities flood control

What three cities form the global centers of economic activity?

Describe and explain the physical and/or chemical methods used to refine the coal

Explain the characteristics of authoritarianism, and identify two Central Asian countries that have this type of government

Why are the rivers so vital to europe's economy?