8thcahpter10 Crossword
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
                            
 
 
Down: 2) the top layer of soil that generally contains humus3) the breakdown of rock into smaller pieces by physical means6) the process by which rainwater dissolves and carries away the minerals and nutrients of topsoil8) gas found in the air12) a chemical reaction in which an element combines with oxygen to form an oxide14) the grinding and wearing down of rock surfaces by other rock or sand particles Across: 1) rock that is the source of soil4) the various methods by which humans take care of the soil5) very small particles of decayed plant and animal material in soil7) the breakdown of rack into smaller and smaller pieces by mechanical or chemical means9) a loose mixture of small mineral fragments and organic material10) the layer of rock beneath soil11) the removal and transport of material by wind, water, or ice13) the chemical breakdown of rocks and minerals into new substances15) a process by which softer, less weather resistant rock wear away, leaving harder, more weather resistant rock16) precipation that contains acids due to air pollution
 

 

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