What are the four social revolutions?

Related questions

1. What is GREY revolution?
2. What is revolution motion?
3. How do you use revolution in a sentence?
4. How do revolutions happen?
5. Do we live in earth or on Earth?
6. What is the definition of revolution in history?
7. Was the French Revolution successful?
8. What is a revolution easy definition?
9. How many revolutions are there?
10. What is Ogburn's theory?

Tags

1. #revolutions
2. #hunting
3. #gathering
4. #steam
5. #engine
6. #social
7. #microchip