Recent researches in Earth and environmental sciences : 2nd International Conference on Advanced Science and Engineering 2019 (ICOASE2019) Zakho-Duhok, Kurdistan Region--Iraq, April 2--4, 2019 /: 2nd International Conference on Advanced Science and Engineering 2019 (ICOASE2019) Zakho-Duhok, Kurdistan Region--Iraq, April 2--4, 2019. (2019)