Answer:
Boron. The answer is boron.
 
        
                    
             
        
        
        
Answer:
The entropy change in the environment is 3.62x10²⁶. 
Explanation:
The entropy change can be calculated using the following equation:

Where:
Q: is the energy transferred = 5.0 MJ 
 : is the Boltzmann constant = 1.38x10⁻²³ J/K
: is the Boltzmann constant = 1.38x10⁻²³ J/K  
 : is the initial temperature = 1000 K
: is the initial temperature = 1000 K
 : is the final temperature = 500 K
: is the final temperature = 500 K
Hence, the entropy change is:
 
                                     
Therefore, the entropy change in the environment is 3.62x10²⁶. 
I hope it helps you!          
 
        
             
        
        
        
Gases are compressible because most of the volume of a gas is composed of the large amounts of empty space between the gas particles. Hope this helped!
        
                    
             
        
        
        
I believe the answer in an inclined plane, because the ridge running along the sides run up the core. (Also, the other two answers are incorrect, so process of elimination)
        
                    
             
        
        
        
Not sure about 2 or 3 but I believe that for number 1 is B or claim 2!!