Answer :

keerthika1998lekha
Thar is known to be a desert area because of lower water resource which lead to less population.
Moreover the Aravaili hills present near the Thar desert obstructs the rainfall of south west monsoon.
This causes low rainfall in these region.
vrushika
thar is a desert as:
1.the Aravalli hills present near the Thar desert obstructs the rainfall of south west monsoon.This causes low rainfall in these region.
2.The average annual rainfall of the region varies from 100 to 500 mm, it is distributed very erratically, occurring mostly between July and September. 

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