What is the cause of annual varaition in the intesity and during the temperature?

What causes annual variation in the intensity and duration of temperature?

What were the main causes of deforestation in India during the British rule?

What causes the rise in atmospheric temperature?

What were the causes of the growth of towns in Europe during the middle age?

The temperature of a town is -14 ""^(@)C at night. During the day, the temperature increases by 7 ""^(@)C . What is the temperature of the town during the day?