Asymmetry of the Falls of the Great Himalayas:
The falls of the great Himalayas are asymmetrical in nature due to various geological processes that have shaped the landscape over millions of years. The asymmetry can be seen in the steep slopes, deep valleys, and rugged terrain of the region.

Reason for the Ganga Plain extending between Ghagra and Tista River:
The Ganga Plain extends between the Ghagra and Tista rivers due to the unique geological and tectonic processes that have taken place in the region.
- Geological Processes: The formation of the Ganga Plain is a result of the deposition of sediments carried by the rivers over millions of years. The rivers originating from the Himalayas bring along with them a huge amount of sediment which gets deposited in the plains, forming fertile land ideal for agriculture.
- Tectonic Activity: The tectonic activity in the region has also played a significant role in the formation of the Ganga Plain. The movement of tectonic plates has caused the land to rise and fall, creating the flat and fertile plains that we see today.
- Drainage Pattern: The drainage pattern of the region, with the Ghagra and Tista rivers acting as boundaries, has also contributed to the formation of the Ganga Plain. The rivers have carved out their paths over millions of years, shaping the landscape and creating the distinct boundaries of the plain.
Overall, the combination of geological processes, tectonic activity, and drainage patterns has led to the formation of the Ganga Plain between the Ghagra and Tista rivers. This unique geographical feature has made the region one of the most fertile and agriculturally productive areas in India.