Part 1. Definition
In this task, we ask you to write an answer to a question about when an event happened. Your answer should be a wrong answer. That is, if you are asked about when an event happened, you should answer with a time that the event didn't likely happen. For example, "going to school" usually happens during the day (not at 2 A.M). Even though there exist multiple wrong answers, we only need a single wrong answer. Please try to keep your "answer" as simple as possible. Concise and simple "answer" is preferred over those complex and verbose ones.
Part 2. Example
Sentence: Jack played basketball after school, after which he was very tired. 
Question: When did Jack play basketball?
Answer: 2 AM.
Explanation: This event likely happened between 3PM to 8PM, definitely not 2AM. So 2 AM is an unlikely option, hence a good answer here.
Part 3. Exercise
Sentence: The massive ice sheet, called a glacier, caused the features on the land you see today. 
Question: When did the glacier start impacting the land's features?
Answer:
10 years ago.