WORLD HISTORY

Detailed explanation-1: -10. The location of the Himalayas, as well as their forbidding height, made them an extremely effective barrier between ancient India and the rest of Asia, allowing the cultures of ancient India to develop without influence from outsiders.

Detailed explanation-2: -This mountain range provided much protection from potential invasions, keeping the ancient Indians in relative safety from attacks for centuries. Second, the Indus and Ganges Rivers in northern India provided rich soil for agriculture as they carried silt down from the Himalayan and Hindu Kush mountain ranges.

Detailed explanation-3: -Indus civilization, also called Indus valley civilization or Harappan civilization, the earliest known urban culture of the Indian subcontinent.

Detailed explanation-4: -The Indo-Greek kingdom was ruled by over 30 Hellenistic (Greek) kings in the northwest and north India from the 2nd century BC to the beginning of the first century AD. The kingdom started when Graeco-Bactrian king Demetrius (son of Euthydemus I) invaded India around 180 BC.