Oh the volcanos in the ocen
        
             
        
        
        
Robert Millikan's oil drop experiment proved that it determined the actual mass of the electron. Robert Millikan was a well known experimental physicist. 
        
                    
             
        
        
        
The crust because there are tectonic plates.
 
        
             
        
        
        
Answer : The final temperature of the metal block is, 
Explanation :

As we know that,  

![m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)]](https://tex.z-dn.net/?f=m_1%5Ctimes%20c_1%5Ctimes%20%28T_%7Bfinal%7D-T_1%29%3D-%5Bm_2%5Ctimes%20c_2%5Ctimes%20%28T_%7Bfinal%7D-T_2%29%5D) .................(1)
         .................(1)
where,
q = heat absorbed or released
 = mass of aluminum = 55 g
 = mass of aluminum = 55 g
 = mass of water = 0.48 g
 = mass of water = 0.48 g
 = final temperature = ?
 = final temperature = ?
 = temperature of aluminum =
 = temperature of aluminum = 
 = temperature of water =
 = temperature of water = 
 = specific heat of aluminum =
 = specific heat of aluminum = 
 = specific heat of water=
 = specific heat of water= 
Now put all the given values in equation (1), we get
![55g\times 0.900J/g^oC\times (T_{final}-25)^oC=-[0.48g\times 4.184J/g^oC\times (T_{final}-25)^oC]](https://tex.z-dn.net/?f=55g%5Ctimes%200.900J%2Fg%5EoC%5Ctimes%20%28T_%7Bfinal%7D-25%29%5EoC%3D-%5B0.48g%5Ctimes%204.184J%2Fg%5EoC%5Ctimes%20%28T_%7Bfinal%7D-25%29%5EoC%5D)

Thus, the final temperature of the metal block is, 
 
        
             
        
        
        
An Insulator.
Insulators prevent flow of electric current. Example is wood, clay.