Half of a mile-long one of these features is located in Mosi-oa-Tunya National Park, which is the only location in its country home to white rhinos. The rate of retreat of these features (-5[3])is (-5[1])inversely (10[1])proportional (-5[2])to their height. (-5[3])One (-5[1])of these features (-5[1])was enclosed (-5[1])and destroyed by the (-5[1])creation of the (-5[1])Itaipu Dam (10[2]-5[1])in (10[1])an (10[1])attempt to draw electricity from that (10[1])one of these features. (10[1]-5[1])Fluvial (10[1]-5[1])sediment (-5[2])transport (-5[2])often (-5[2])creates (10[1]-5[1])plunge (10[1]-5[2])pools at the base (10[1])of these (10[3])features. (10[6]-5[5])The (10[1])Garganta (10[1])del Diablo is a cataract at the base of one of these features along the Iguazu (10[1])River. For 10 points, one of what feature located on the Zambezi river between Zambia (10[1])and Zimbabwe (10[1])is named after Queen Victoria? (10[6])■END■ (10[20]0[4])