instruction:
In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.
question:
Question: Simon was digging in his yard and found that the rocks that were deeper in the ground, compared to the surface rocks, were likely 
 Answer: older
answer:
Therefore, deeper rock layers must be older than layers closer to the surface.


question:
Question: Carbon dioxide levels increasing cause the temperature to 
 Answer: increase
answer:
An increase in greenhouse gases leads to greater greenhouse effect.


question:
Question: Jeff has dark skin and stays on the beach with Layla, who has light skin, for 2 hours. Neither use sunblock. Who is likely more sunburned? 
 Answer: Lydia
answer:

Light-skinned people get sunburned more quickly than people with darker skin.