Explanation:

 Arid and dusty, Rajasthan is India’s largest producer of sandstone. Over the years, concerns have grown about working practices in the state’s quarries and stone processing yards, in particular around the use of child labour and the health and safety of workers. Most of Rajasthan’s sandstone is destined for India’s domestic market. But up to seven per cent is exported. Of this, one fifth is sent to the UK, where it is used in commercial and domestic driveways, patios and pavements.