Wind and Water Erosion - We learned that wind and water are the two most important agents of weathering, erosion, and deposition. Fast moving water can change the shape of rocks and strong winds can move sediment great distances. Young streams in mountains have the greatest energy and create V-shaped valleys. Then we learned that slower moving, mature streams erode the sides more than the bottoms of their channels creating meanders. Next we played a game where we identified how different rocks and minerals were formed.