instruction:
In this task, you're given an ambiguous question (which can be answered in more than one way). Your task is to provide one question which clarifies the input question and it has one unique answer, and also provide an answer to the generated question. Generated question and answer should be separated with a new line.
question:
What is formed on top of continental crust?
answer:
What is formed on top of the continental crust known as continental shelves? 
 ocean waters


question:
When does the dominion war start in ds9?
answer:
Based on the time frame of Star trek, when does the dominion war start in DS9? 
 2373


question:
Who is in charge if president is impeached?
answer:

Who is in charge of the  Senate trial if the US president is impeached? 
 Chief Justice