TASK DEFINITION: In this task, you are given a sentence and a question, you would be asked to create the answer which is contained in the sentence provided.
PROBLEM: Sentence: In weather terms, the boundary between two air masses is called front. Question: In weather terms, what do you call the boundary between two air masses?

SOLUTION: front

PROBLEM: Sentence: Density describes how much matter is in a certain amount of space. Question: What describes how much matter is in a certain amount of space?

SOLUTION: density

PROBLEM: Sentence: Evaporation and condensation are similar because both are caused by changes in heat energy. Question: In which way are evaporation and condensation similar?

SOLUTION:
Both are caused by changes in heat energy.