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: Slowing plate tectonics indicates convection is 
 Answer: decreasing
[EX A]: Convection on early Earth was faster and so plate tectonics was faster.

[EX Q]: Question: Milo owns two telescopes, one at the top of a mountain and one at the base. If he looks through the one at the top of the mountain, how much interference can he expect compared to the one at the bottom of the mountain? 
 Answer: less
[EX A]: Many observatories are built on high mountains. There is less air above the telescope, so there is less interference from the atmosphere.

[EX Q]: Question: If Milo is hunting for water and he finds two water sources, which one will it be harder for him to extract water from? 
 Answer: one far from the surface
[EX A]:
The closer to the surface an aquifer is, the easier it is to get the water.