Presents the greatest problem for eastern europe.

a.) water quantity

b.) water quality

What is the result of the greenhouse effect? a. heat is deflected from the atmosphere. b. heat is released from the atmosphere. c. heat is kept in the atmosphere. d. plants are able to grow in the tropics where the air is the heaviest.

What major factors play a role in global warming? 1. human activity and normal climate conditions 2. natural factors and human activity 3. normal climate conditions and abnormal human activities 4. abnormal human activities and natural factors

Hurricanes a. usually form over land b. usually intensify over land c. gain strength from ocean heat d. usually form over the poles