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.

[Q]: Question: Mike needed to get a dark picture . In order to get the darkest photo, Mike made the exposure 
 Answer: shorter
[A]: The longer the exposure, the more light that the telescope can gather to make the image.


[Q]: Question: When we lower the temperature of water it becomes 
 Answer: more dense
[A]: When a volume of water is cooled, the molecules move less vigorously, so same number of molecules takes up less space and the water is denser.


[Q]: Question: When we have a lot less greenhouse gases in the air what happens to the temperature? 
 Answer: stays the same
[A]:
As greenhouse gases increase, changes will be more extreme.