female animal because of attractive features such as the 

 bright coloration of the male. 



Shade Plant 



A plant that can grow in the shade, cf. Heliophyllous. 



Shale 



An easily splitting sedimentary rock formed from clay 

 or silt. 



Shamal 



A wind that blows with considerable constancy, carrying 

 much dust, in Iraq. 



Sheep Month 



The amount of forage or feed required for maintenance 

 by a mature sheep or an ewe and its suckling lamb for 30 

 days, usually figured as equivalent to one-fifth of a Cow 

 month (q. v.). 



Sheet Erosion 



The erosion or removal of a rather uniform layer of soil 

 from the surface of the land by rainfall and Run-off water, 

 cf. Gully erosion, Rill erosion. 



Shelter 



The conditions, objects, or material that provide organ- 

 isms suitable resting places or protection from attack by 

 predators or from unfavorable conditions of the physical 

 environment, cf. Covert. 



Shelterbelt 



A long Windbreak of living trees and shrubs extending 

 over an area larger than a single farm. 



Shingle 



More or less rounded pebbles varying in size, often mixed 

 with sand, on seashores. 



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