Answer:
1)2500-1500 b.c.e
2)The Vindhya mountains made travel and communication difficult for centuries. ... Asia, the mountains surrounding the deccan prevented them from moving into the interior.
3)Himalaya Mountains and the Mount Everest.
4)Indus and the Ganges
5)the Hindu Kush, Karakorum, and Himalayan ranges.
6)Many scholars believe that the collapse of the Indus Valley Civilization was caused by climate change. By 1800 BCE, the Indus Valley climate grew cooler and drier, and a tectonic event may have diverted river systems, which were the lifelines of the Indus Valley Civilization.
7)Harappa and Mohenjo-daro
9)The caste system had four main groups: the Brahmins consisting of priests and kings; the Kshatriyas, the warriors and aristocrats; the Vaishyas, cultivators, artisans and merchants; and the Shudras or peasants and serfs.
I answered all the question i know hope it is helpfull