Explanation:

The Thar desert is also called the ‘Great Indian Desert’.

• It is located partly in Rajasthan state, northwestern India, and partly in Punjab and Sindh provinces, eastern Pakistan.
• It is bordered by the irrigated Indus River plain to the west, the Punjab Plain to the north and northeast, the Aravalli Range to the southeast, and the Rann of Kachchh to the south.
• The surface of Thar consists of aeolian (wind-deposited) sand that has accumulated over the past 1.8 million years.
• Presents an undulating surface, with high and low sand dunes separated by sandy plains and low barren hills, or bhakars, which rise abruptly from the surrounding plains.
• Barchan, also spelled Barkhan are crescent-shaped sand dune produced by the action of wind predominately from one direction. 
• Several playas (saline lake beds), locally known as dhands, are scattered throughout the region.

Hence only statement 1st is correct.