TASK DEFINITION: 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.
PROBLEM: 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

SOLUTION: Friction causes the molecules on rubbing surfaces to move faster, so they have more heat energy.

PROBLEM: Question: If an item has few carbon atoms its boiling point will be 
 Answer: low

SOLUTION: Alkanes with more carbon atoms generally have higher boiling and melting points.

PROBLEM: Question: If Milo's country begins decreasing the size of its population, what happens to its growth rate? 
 Answer: it decreases

SOLUTION:
With exponential growth, the population starts out growing slowly. As population size increases, the growth rate also increases.