In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

[Q]: Question: Hot magma beneath the surface mixes with water and forms what? Answer: gas
[A]: Hot magma beneath the surface mixes with water and forms gas.


[Q]: Question: Are vesicles larger or smaller than vacuoles? Answer: smaller
[A]: Are vesicles larger or smaller than vacuoles?


[Q]: Question: What do craters and rifts become when the fill with water? Answer: lakes
[A]:
Craters and rifts become lakes when they fill with water.