1) what river do the vietnamese use to irrigate their crops? 2) As an exporter of rice, where does Vietnam rank?

Explain why components that are naturally found in air can be considered air pollutants.

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

Suggest two reasons why irrigation is important for human development of the desert