8.2 Wind

Pages 191-197

Goal 1

Learn wind erosion terms

Goal 1: Be familiar with wind erosion terms

• Suspension • Saltation

Goal 1: Be familiar with wind erosion terms

• Deflation • Abrasion

Goal 1: Be familiar with wind erosion terms

• Ventifact

Goal 2

Identify 3 conditions that contribute to wind erosion

1. Dry conditions

2. Little vegetation

3. Sea shores and Lake shores

Goal 3

Recognize types of dunes; areas where they form and their

migration direction

• Barchan– Crescent shape– Arms point Wind

direction – Flat area– Little vegetation

• Parabolic Dunes– Crescent shape– Arms anchored– Nose points

direction– Some vegetation– Coasts

• Transverse Dunes– Lined up– Perpendicular wind– High winds– Lots-o-sand– Barchans joined

together

• Longitudinal Dunes– Lined-up– Wind direction

parallel– High, variable wind– Limited sand

• Star dunes– Collection of

Barchans

Picture Credits• http://www.co.mendocino.ca.us/aqmd/images/Saltation.jpg• http://www.uwsp.edu/geo/projects/geoweb/participants/dutch/202SL

IDE/WINDSLID.HTM• http://gpc.edu/~pgore/Earth&Space/GPS/erosion.html• http://www.earthscienceworld.org/images/search/results.html?

Keyword=Ventifact• http://www.indiana.edu/~g103/G103/Week8/sphinx.jpg• http://www.exploratorium.edu/origins/antarctica/fieldnotes/images/

fventifact400.jpeg• http://icemanphil.blogspot.com/2005/01/my-holiday-outing.html• http://math.ucr.edu/home/baez/barchan.jpg• http://www.personal.rdg.ac.uk/~sgswitke/linears.jpg