Answer: im not sure im only in 8th grade but im pretty sure  Erosion i started learning about this last year i really cant explain it... im still hainving trouble with it.
Explanation:
 
        
             
        
        
        
The answer you’re looking for is 0.250
        
             
        
        
        
answer is A
The kinetic theory is used to explain the behaviour of gases. 
One of the assumptions states that "a gas is composed of a large number of identical molecules moving at different speeds". 
 
        
                    
             
        
        
        
Answer:
For example, a suitcase jam-packed with clothes and souvenirs has a high density, while the same suitcase containing two pairs of underwear has low density. Size-wise, both suitcases look the same, but their density depends on the relationship between their mass and volume. Mass is the amount of matter in an object.
 
        
                    
             
        
        
        
Metals usually become cations since electrons are negatively charged and when they are lost there are more protons than electrons making a positive net charge in the atom.  (cations are positively charged ions while anions are negatively charged ions)
I hope this helps.  Let me know if anything is unclear.