The chemical make-up of a rock refers to its composition. Your answer is correct. This is because geologists determine the amount of occurring inorganic solids and chemical composition in minerals the make-up a particular kind of rock. The variety of arrangements of chemical elements in a rock determine its basic or complex composition.
        
                    
             
        
        
        
Human-Enviornmental Interaction
        
             
        
        
        
Answer:
 It has been reduced to scrub vegetation by overgrazing.
Explanation:
 
        
             
        
        
        
Ferromagnesian                   vs.            non-ferromagnesian 
-------------------------------                        ----------------------------
1-Contains Magnesium and Iron          1- Contains little or no Magnesium &
as major components                               Iron
2- Color: very  dark                               2- Color: Generally lighter
3- Density relatively high                      3- Density relatively low