Al- Khalifat MDS. The effect of the self- questioning strategy on the development of academic achievement in the field of earth sciences among second secondary students in the southern Jordan Valley. JEPS [Internet]. 2020 Feb. 29 [cited 2025 Dec. 21];4(5):44-29. Available from: https://www.ajsrp.ojsexpert.com/index.php/jeps/article/view/2178