Answer:

Explanation:
Given
--- starting index
Required
Change the starting index to 
We have:

To change the starting index to k, we simply rewrite as:

<em>In this case; k=1; so, the starting index will be: </em>
<em />
ANSWER:
Minerals can form deep inside earth's crust by the crystallization of melted materials. There are two ways on how minerals are formed: crystallization of melted materials and the crystallization of materials dissolved in water.
Hope this helps!