A waterfall is a vertical drop in the upper course of a river., Glenbarrow waterfall is in the Slieve Bloom Mountains., Torc Waterfall is in Killarney Co Kerry., In the upper course of a river the gradient is steep., Granite is an example of a hard rock., Limestone is an example of a soft rock., Differential erosion occurs where soft rock is worn away at a faster rate than resistant hard rock.,

Rivers Jumble One

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