GEOL 1 Lecture Notes - Lecture 17: 30Th Parallel North, Rain Shadow, Deflation

• School: Irvine Valley College
• Department: Geology
• Course: GEOL 1
• Professor: Bordelon

Document Summary

Odd seismic waves help study carbon dioxide movement underground. Classified by lack of rainfall is the key (< 10 in/yr) 30 degrees north or south of the equator. Because more heat energy at this level due to hadley cells. Yellow areas on map: (middle country deserts) Rain shadow effects due to the middle of the country being dry due to distance water would need to travel. Rare, but no vegetation to constrain it. Dry creek basin that can rapidly fill with water. Wind can only move relatively small particles. Wind has low density and low viscosity. Particles > ca 0. 06 mm in diameter hard to erode. Can still add up to a huge volume eroded. Sahara desert pumps 250-500 million tons of sand into. Only moves fine grains and coarse particles sink becoming more compacted. A lot of coarse grain material together after deflation ends. Only covers about 20% of all desert areas are covered in sand!