Where do most rivers start their journey?, High Mountains, The Deep Ocean, Flat Deserts, What is the very first "starting point" called?, The Mouth, The Source, The Middle, What is it called when sand and rocks wear away the river?, Permeable, Hard Rock, Erosion, Because of erosion, a river slowly forms a..., V-shaped valley, Square tunnel, Flat plateau, What makes a river flow faster and get bigger?, Permeable rocks, Large glaciers, Heavy rain or melted snow, What is created when water swirls rocks in a hollow?, A V-shaped valley, A plunge pool, A mountain lake.

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