Presentation on theme: "Chapter 16.1 By: Gabriella Simone And Jessica Roldan."— Presentation transcript:
Chapter 16.1 By: Gabriella Simone And Jessica Roldan
Describe two ways that the wind erodes the land Compare the two types of wind
Wind Erosion Much energy that is found in the wind can be used to turn a wind turbine or move a sailboat. When wind erodes land, it carries rock particles that are different sizes. Wind also moves sand and dust in different ways. For example, sand is moved along by jumps and bounces caused by wind or water, which is called saltation because wind cant keep up with the smallest particles of sand. Dust particles are lifted by the wind and carried high into the air. When a volcanic eruption occurs, the dust remains in the atmosphere for many years before falling to the ground. Dust storms are created by strong wind that lift enormous amounts of dust into the atmosphere.
Effects of Wind Erosion The force of wind erodes in many different ways. Deflation- most common form of wind erosion in which fine, dry soil particles are blown away. Deflation causes shallow depressions that form in areas where natural plant cover has been removed. As an are of dry soil, bare soil will be exposed to wind. The wind will then strip off the topsoil. Desert Pavement- surface of closely packed small rocks left after the top layer of soil has been removed by deflation. Desert pavements is more commonly shown in dry climates because wind erosion takes place faster in dry climates than in humid. Deflation Hollow- shallow depression left after the wind has eroded a layer of exposed soil. Ventifact- any stone smoothed by wind abrasion.
Wind Deposition All material that is eroded by wind is eventually deposited. The winds speed has a part in determining the size of the particles. The cementing action of minerals carried in water and pressure are two factors that bind the fragments to form sedimentary rock.
Dunes Dunes- mound of windblown sand. Places to find dunes are some deserts, large lakes, and along the shores of oceans A slipface is the sand thats blown over a peak or a crest of the dune and that tumbles down the opposite side. Other types of dunes include, barchan, parabolic, transverse, and longitudinal. The direction and force of the wind results in the complicated shape of dunes. Dune migration occurs when sand is blown over the crest, off the windward side or is built up on the slipface.
Loess Loess- thick, yellowish deposit of wind blown dust. Loess is found mostly in northern China. It originally came from the Goby Desert. Loess deposits provide good soil for grain- growing regions because, its very fertile.