What has formed the kara-kum and the kyzyl kum in central Asia?

The Kara-Kum and Kyzyl Kum deserts in Central Asia were formed primarily from the arid climate and lack of significant rainfall in the region. These deserts have been shaped over millions of years by the natural processes of erosion and sediment accumulation, resulting in the vast stretches of sand dunes and barren landscapes that exist today. Additionally, tectonic activity and shifting geological plates have also played a role in the formation of these deserts.