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: Ian decreases the pH of his water. Its pH value becomes more 
 Answer: acidic
answer:
The more basic a solution is, the closer its pH value will be to 14.


question:
Question: Reid notices no change in the weather and temperature from 100 years ago. This likely was caused by _____ greenhouse gas levels. 
 Answer: decreased
answer:
As greenhouse gases increase, changes will be more extreme.


question:
Question: Allie looks for sunscreen at the store. She sees SPF 30 and SPF 100. Which likely protects her skin better? 
 Answer: SPF 100
answer:

A sunscreen with a higher SPF value protects the skin longer.