Most of the land is dry. Nepal is also considered as the country with highly diverse ethnic groups. In a small country, about 36 different ethnic groups live in Nepal. They speak their own language and dialects. About 12 have their own script.
Monsoon is the name of the wind that brings rain to the Indian sub-continent, including Nepal.
Here is how it is formed. The Indian sub-continent becomes warmer than the surrounding Indian ocean in summer. The result is that the continent becomes the center of rising warm air. When the warm air rises it creates low pressure. Therefore winds start flowing toward Indian sub-continent from the Indian Ocean.