https://uomosul.edu.iq/environmentalscience/%d8%a7%d9%84%d8%b2%d9%8a-%d8%a7%d9%84%d9%85%d9%88%d8%ad%d8%af-%d9%83%d9%84%d9%8a%d8%a9-%d8%a7%d9%84%d8%a8%d9%8a%d8%a6%d8%a9-2/