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.

[EX Q]: Question: Greta yells across the canyon in the cool morning and again in the hot afternoon. The sound likely traveled _____ in the morning. 
 Answer: faster
[EX A]: For a given medium, sound has a slower speed at lower temperatures.

[EX Q]: Question: If Jim begins emitting more greenhouse gases into the air it means that the air will become 
 Answer: warmer
[EX A]: More greenhouse gases trap more heat and warm the atmosphere.

[EX Q]: Question: If Jim is playing with some objects and moving them around and he moves them farther apart, the gravitational force between them 
 Answer: decreases
[EX A]:
The closer objects are to each other, the stronger the gravitational force between them.