Inspection and repair paper

Help me study for my Engineering class. I’m stuck and don’t understand.

Write a one page paper about the question below.

“The topic I would like to research is the impact that the drastic changes in temperature have on structural fatigue, i.e operating conducting flights on the regular between the Caribbean and Canada or just from the surface temperatures and flying at altitude. I choose this because let’s say there was a small crack or defect that allows the trapped liquid to freeze and melt as these different temperatures occur. What’s the impact?