Answer:
a) divergent boundaries by submarine eruptions and intrusions of basaltic magma 
Explanation:
Divergent boundary is where tectonic plate move apart from each other. Divergent boundary is mostly prevalent in the oceanic crust. The opposing plate tends to move apart from each other.
On the oceanic crust plates move apart from each other causing an upwelling of magma from the aesthenosphere. This magmatic material is introduced through the oceanic ridges. As the magma are introduce the opposing plates separates further . The basaltic magma introduced through the oceanic ridges forms the new oceanic crust. As we move away from the oceanic ridge the rocks gets older . The oceanic ridge where the basaltic magma erupt depict the youngest rocks.
 
        
             
        
        
        
Can you send a picture of what you're working with
        
             
        
        
        
Answer: Global wind patterns affect how air masses move. Prevailing westerlies are the major wind belts in the continental United States. The prevailing westerlies generally push air masses from west to east. For example, continental polar masses from central Canada enter the United States between the Rocky Mountains and the Great Lakes. These cold, dry air masses are blown east and affect the weather in the central and eastern part of the United States.
Explanation:
 
        
             
        
        
        
It is mainly wheat and corn.