What is the primary function of earth atmosphere a. to trap heat from the sun. b. to shield the planet from harmful radiation. c. to disintegrate space debris before to reaches the surface. d. all of the above.

Which of the following areas have the highest population density? a) quebecb) united statesc) californiad) new york city

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