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: Jeff noticed the food supply changed over time in his city. The advent of farming machines likely caused the food supply to 
 Answer: increase
[A]: Better farming techniques and machines increased the food supply and the distribution of food.


[Q]: Question: Jimbo was playing on his sled one day. He slid down a snowy hill and then slid down a rocky hill. Which hill created less heat energy? 
 Answer: snowy hill
[A]: Friction causes the molecules on rubbing surfaces to move faster, so they have more heat energy.


[Q]: Question: John was looking at a refractive index and observing the light. The less speed the light had, it would bend 
 Answer: Less
[A]:
In refraction of light, the greater the change in speed, the more light bends.