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.

Example Input: Question: Ron was playing with a flashlight. He moved it back and forth slowly, and then quickly. Which motion likely caused less light to bend? 
 Answer: the slow motion
Example Output: In refraction of light, the greater the change in speed, the more light bends.

Example Input: Question: When people move to an area what happens to the land? 
 Answer: cleared
Example Output: More people also means more clearing of land for agriculture and development.

Example Input: Question: Noah compares the density of the water in a pond during a hot July day and a cold winter morning. The water on the July day is 
 Answer: less dense.
Example Output:
Lower temperature and higher salinity yield the densest water.