When speaking, we can pause or change the tone of our voices to indicate emphasis. When writing, we must use punctuation to indicate these places of emphasis. This resource should help to clarify when and how to use various marks of punctuation.
Vagaries of weather and regular flooding: Farmers learnt to control the floods and grew some of the most valuable crops like flax, barley, wheat, fruits and vegetables that helped the economy progress. But the climate in Mesopotamia was hazardous with temperatures during the summer months ranging from 110 to 130F. Nearly eight months in a year was characterized by very dry conditions with the edges of the rivers Tigris and Euphrates turning muddy brown.
As the largest salt flat on Earth, Salar de Uyuni is especially suitable for this purpose. In the low-rain period from April to November, due to the absence of industry and its high elevation, the skies above Salar de Uyuni are very clear, and the air is dry (relative humidity is about 30%; rainfall is roughly 1 millimetre or 0.039 inches per month).