The ans is - Geothermal
What country was the main source of the straw hats which became popular in the 18th and 19th century among gold seekers and work crews on a major canal being dug at the time?
China has blocked a tributary as part of the construction of its "most expensive" hydro-power project that could cause concern in India as it may impact water flows into the lower riparian countries.
What is the name of tributary and main river?
