Which greenhouse gas has an average lifetime in the atmosphere of a few weeks to thousands of years and is the largest contributor to climate change?

a) carbon dioxide

b) methane

c) nitrous oxide

D) fluorinated gas

Sub-Saharan Africa is studied as a region because

Which of the following statements about the European Union is false? A. No tariffs on trade are allowed between member nations. B. Together, the nations of the EU have the world's largest economy. C.

Is Mt. st helens man made or natural

20. Which statement best describes saturation? A. Saturation is reached when the amount of water vapor in the air has reached the maximum amount. B. Saturation refers to the total rainfall for a year. C. Saturation occurs only in hot, dry climates.

True or False: When continental plates collide, a volcano is formed.

If sea level rises above a coral reef, what may happen to the reef? << read less

How are the land forms of Europe both an advantage and a disadvantage to life in Europe?

Which asian capital was formerly known as edo?

Volcanic eruptions affect many populated areas. Which of the following pieces of evidence would a geologists use to predict future eruptions?

When Two Plates Collide Causing Crust To Deform, But Not Break, it Is Called?