A MOUNTAIN RANGE is a landform with high elevation and a more or less level surface
Answer : The value of diffusion coefficient is, 
Explanation :
Formula used :

where,
D = diffusion coefficient = ?
= 
= 
R = gas constant = 8.314 J/mol.K
T = temperature = 
Now put all the given values in the above formula, we get:


Thus, the value of diffusion coefficient is, 
Answer:
a) positive feedback
Explanation:
positive as in increasing
The corrects answer is 259 K
Solids' particles move a lot faster and closer together. Liquids' are more spread apart and move slower. So there is more energy in the solid