Fig. 5

a General map of Egypt, where the red square marks the Abusir zone, referring to the Abusir archaeological site in an orange circle (b). c The treated satellite image on the NASA Terra satellite (May 2010) explains the dust and sandstorms over Egypt spirally in blue, which extends strongly from the red sea and Nile River to the Mediterranean Sea. The amount of sand and dust thickly exists and results in the total hiding of the land surface below (edited after https://earthobservatory.nasa.gov/images). d The treated satellite image from the NASA Terra satellite (April 2012) explains the dust and sandstorms in blue, which extends strongly from north-northeast to south-southwest. The amount of sand and dust is high, resulting in the total hiding of the land surface below (edited after https://earthobservatory.nasa.gov/images)