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: Where does the stratosphere get most of its heat? Answer: sun
Sun does the stratosphere get most of its heat.

Question: Which observation demonstrates that light waves travel much faster than sound waves? Answer: An exploding firework is seen before it is heard.
An exploding firework is seen before it is heard observation demonstrates that light waves travel much faster than sound waves.

Question: The anion is the methanoate ion, which is commonly called the what? Answer: formate ion

The anion is the methanoate ion, which is commonly called the formate ion.