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Jatka keskusteluunWhy does the long profile of a river become concave in the middle course? https://www.internetgeography.net/flashcard/why-does-the-long-profile-of-a-river-become-concave-in-the-middle-course/
Why does the long profile of a river become concave in the middle course? https://www.internetgeography.net/flashcard/why-does-the-long-profile-of-a-river-become-concave-in-the-middle-course/