All the water on earth, including the water in the atmosphere, makes up the

a. biosphere.

b. hydrosphere.

c. geosphere.

d. atmosphere.

Where did all the sand in the sahara desert come from?

List and describe the evidence used to support the plate tectonics theory.

When slate is changed by heat and pressure what does it form into

How does Canadian education work? is it online?

Freedom and __ make market economies possible

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?