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: If Jupiter has a bigger orbit then Mercury, which planet will take a shorter time to revolve around the Sun? 
 Answer: Mercury
[A]: The planets further from the Sun will have bigger orbits, and therefore take longer to revolve around the Sun.


[Q]: Question: If John increases the rate at which gas exits the bottom of his rocket, what will happen to the upward momentum of the rocket? It will 
 Answer: increase
[A]: The rocket goes upwards because the hot gases shoot downwards out of the nozzle. The faster the gases go downwards, the faster the rocket goes upwards.


[Q]: Question: Will decreases the population of his model of the world's population. The amount of water scarcity, if no other variables are changed, will likely go 
 Answer: down
[A]:
Many of the worlds people live with water scarcity, and that percentage will increase as populations increase and climate changes.