How might the countries of Southern Africa protect and develop their tourist industries?

What statistics are to determine the development of a nation?

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

Plzz on what physical process is responsible for the creation of volcanoes, earthquakes and ocean trenches at the plate margins?