Where does most of the world's population tend to settle?
near mountain valleys

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

There is only one climate type in motion across the world at a time

5. what is a red giant? can our sun become a red giant? why or why not?