publication Conference Paper 2021 Geochronology and Geochemistry of Volcanism at Harrat Ithnayn, Western Saudi Arabia more of publication Geochronology and Geochemistry of Volcanism at Harrat Ithnayn, Western Saudi Arabia 2021 The Combination of Principal Component Analysis and Geostatistics as a Technique in Assessment of Groundwater Hydrochemistry in Arid Environment: A case study of Central Saudi Arabia. Yousef Nazzal1*, Faisal K. Zaidi1, Izrar Ahmed2, Habes Ghrefat1, Muham The Combination of Principal Component Analysis and Geostatistics as a Technique in Assessment of Groundwater Hydrochemistry in Arid Environment: A case study of Central Saudi Arabia.… 2014