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: What is it called when poles are in opposite positions? Answer: reversed polarity
[A]: Reversed polarity is it called when poles are in opposite positions.

[Q]: Question: What are drilled to monitor groundwater pollution? Answer: test wells
[A]: Test wells are drilled to monitor groundwater pollution.

[Q]: Question: When magma heats groundwater, it may come to the surface as a hot spring or a what? Answer: geyser
[A]:
When magma heats groundwater, it may come to the surface as a hot spring or a geyser.