The answer is D because they would have to make quarries just below the surface to mine 
Mineral ores much quicker (Quarries- a large hole/pit under ground used to get stone and minerals)
        
             
        
        
        
Answer: (D) environmental chemistry 
Explanation:
 
        
             
        
        
        
Answer:

Explanation:
Hello there!
In this case, since we have a problem about volume-pressure relationship, the idea here is to use the Boyle's law to calculate the final volume as shown below:

Then, we plug in the initial and final pressures and the initial volume to obtain:

Regards!
 
        
             
        
        
        
Answer:
a
Explanation:
Density is a physical property.