Final answer:
The Vedas were transmitted orally by the Aryans and later recorded in Sanskrit. They played a significant role in Aryan society and shaped their social hierarchy.
Step-by-step explanation:
The Vedas were not written down by the Aryans in 1800 BCE. Instead, the Vedas were initially transmitted orally from one generation to the next.
It was only later that they were recorded in the written language of Sanskrit. The Vedas are a collection of religious texts that were composed between 1500 and 900 BCE by the Indo-Aryan tribes that settled in northern India.
The Vedas played a significant role in the Vedic religion of the Aryans and shaped the social hierarchy of Aryan society at that time.