Fig. 1

Location map of the study area, (a) spatial location of Egypt (hachured blue) relative to the Africa (gray) created by map chart, (b) spatial location of Beni-Swef district (green) relative to Egypt (gray) [a & b created by map chart, https://www.mapchart.net/], (c) spatial location of the collected studied samples area, which covered an area at west of Beni-Swef [the image source is https://www.google.com/earth/about/versions/ and full image were created and presented using Surfer66 V.15.5.382, https://www.goldensofware.com/products/surfer/.