Siblings (Sibs) 



The offspring, brothers and sisters taken collectively, from 

 the same parents. 



Sibljack 



Shrub vegetation on deforested land in the Balkan 

 Peninsula. 



Siccation 



Processes that include the diminution of rainfall (desicca- 

 tion) and the drying out of the earth's crust and atmosphere. 

 (Exsiccation, q. v.) 



Siccideserta 



Dry areas such as steppe and desert occupied by open 

 vegetation. 



Siccocolous 



See Xerophilous. 



Sierozem 



A Zonal group of soils with brownish gray surface hori- 

 zons that grade through lighter colored material to a layer 

 with accumulated calcium carbonate, in arid temperate 

 climates where vegetation usually is shrubby. 



Sierra 



A chain of mountains with jagged tops. 



Sieve Tube 



A tube of cells connected end to end, part of the Phloem 

 tissue in plants, used to conduct food. 



Silage 



The partly fermented above-ground parts of crops such 

 as corn, sorghum, legumes, or grasses preserved in a succulent 

 condition for feeding livestock. 



Silt 



Mineral particles in the soil, intermediate between clay 



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