In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

[Q]: Question: Elements below the second period, such as silicon, do not form what as readily as second-period elements, and when they do form, they are weaker than those formed by second-period elements? Answer: n bonds
[A]: Elements below the second period, such as silicon, do not form n bonds as readily as second-period elements, and when they do form, they are weaker than those formed by second-period elements.


[Q]: Question: Over 90% of the energy we use comes originally from what? Answer: sun
[A]: Over 90% of the energy we use comes originally from the sun.


[Q]: Question: What type of lens is thicker at the edges than it is in the middle? Answer: concave lens
[A]:
A concave lens is thicker at the edges than it is in the middle.