Horizontal lines of latitude that run across the globe are known as A. parallels.
It is 23.7 km south of welgemoed, western cape, south africa
The answer is - Sunspots.
Sunspots are dark in appearance, but only on a visible light, and this is due to the fact that they are much cooler than the surrounding areas, but that doesn't mean by any means that the sunspots are cool, on contrary, they are very hot too. Sunspots actually are storms that appear in the lower atmosphere of the sun.
30 °C is around the average temperature during summer
The Indus valley thrived between 4000 and 1500 BC
