instruction:
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.
question:
Question: Hot magma beneath the surface mixes with water and forms what? Answer: gas
answer:
Hot magma beneath the surface mixes with water and forms gas.


question:
Question: What can be used to determine the mass of a quantity of material? Answer: molar masses
answer:
Molar masses can be used to determine the mass of a quantity of material.


question:
Question: What affects the boiling point of water? Answer: external pressure
answer:

External pressure affects the boiling point of water.