Ruhiorg
Ruhiorg ehk troog (inglise glacial trough) on U-kujulise ristprofiiliga liustikutekkeline org.
Ruhiorud on kunagised alpiliustike liikumisteed. Ruhiorgude suudmeosa mere poolt üleujutamise tagajärjel on tekkinud fjordid.
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