Answer:
A large amount of heat and pressure
 
        
                    
             
        
        
        
By the unequal heating of earths surface 
        
             
        
        
        
Hopefully this quizlet  an help you.
<span>https://quizlet.com/35658769/chapter-12-flash-cards/</span>
        
                    
             
        
        
        
Answer:
7.8 Billion, but to round it...t is 8 Billion
Explanation:
This is the question to search up. I don't think anyone but the internet knows how many people exist...if you understand.