There are four settled societies that each developed agriculture independently along major rivers that are traditionally considered the early river valley civilizations. The are the Mesopotamian civilizations, the Nile River civilizations, the Indus River civilizations, and the Yellow and Yangtze River civilizations.
The solar max is a period when the activities of the sun gets started for a period of 11 years which is cyclic in nature and occurrence of the solar flares and suns radiance increase also there an increase in the sunspots and it affects the weather patterns on earth and also can lead to magnetic fields interaction on earth.
