Answer:
The Galapagos Islands were studied
 
        
             
        
        
        
Alluvial fan could be the answer. Alluvial fans are cone shaped deposits of sedimentary particles. The particles can be sand. silt, gravel or clay. These land-forms are formed at the mouth of canyons or in valleys where ephemeral streams can occasionally transport material to the mouth of the canyons. An ephemeral stream is one that is created after a shower of rain or other form of precipitation; they are not permanent streams.   <span />
        
             
        
        
        
The answer would be : <span>c. chemical weathering.
Hope this helps !
Photon</span>
        
                    
             
        
        
        
African 
Antarctic 
Eurasian 
Australian
North America 
Pacific
South America 
Hope this is right....
        
             
        
        
        
This question. Is making a question out of a sentence. Here is a graph of the global temps over the millennia.