Agents of Erosion and Deposition Chapter 12 Wind Erosion and Deposition Chapter 12-2 The Process of Wind Erosion _____________ eroding agent by itself, but has very dramatic impact on the landscape over a long period of time. _____________ is the skipping and bouncing movement of sand or other sediments, caused by _______ or _________. __________ sand grains knock into one another, bounce up into the air, fall forward, and strike other sand grains, causing them to _______ and __________ forward. The Process of Wind Erosion 2 _____________ is a form of wind erosion in which fine, dry soil particles are blown away, removing the top layer of fine sediment or soil and leaving behind rock fragments that are too heavy to be _____________ by the __________. Deflation may cause __________ _______________, which is a surface consisting of pebbles and small broken rock. Scooped-out depressions in the landscape are called __________ ___________. The Process of Wind Erosion 3 _____________ is the grinding and wearing away of rock surfaces through the mechanical action of other rock or sand _____________. Abrasion commonly happens in areas where there are ___________ __________, loose sand, and soft rocks. The blowing of millions of sharp sand grains ____________ a sandblasting effect, helping erode, smooth, and polish rocks. Wind Deposited Materials Wind-Deposited Materials 2 _________ is a deposit of windblown, fine-grained sediment. Usually formed during _________ periods. ________: When the wind hits an ______, the wind slows down, ____________ the heavier material. The material _____________, creating an additional obstacle and eventually forming a _____________ that buries the original obstacle. Because wind can carry finegrained material much higher and farther than it carries _______, loess deposits are sometimes found far from their __________. Very ______ and ________. The mounds of wind-deposited sand are called ____________. A dune keeps its shape, even though it moves. ________ move in the same ________________ the wind does. Leeward slope Wind-Deposited Materials 3 The Movement of Dunes: Different wind conditions produce dunes in various shapes and sizes. A dune usually has a gently sloped side and a steeply sloped side, called a _____________________.