Geographic Alliance, Michigan. "Water Quality - Lesson 1 : Where is All the Water in the World?". OER Commons. Institute for the Study of Knowledge Management in Education, 18 Feb. 2020. Web. 22 Nov. 2024. <https://goopenmichigan.org/authoring/306-water-quality-lesson-1-where-is-all-the-water-in-t>.
Geographic Alliance, M. (2020, February 18). Water Quality - Lesson 1 : Where is All the Water in the World?. OER Commons. Retrieved November 22, 2024, from https://goopenmichigan.org/authoring/306-water-quality-lesson-1-where-is-all-the-water-in-t.