Write an inquisitive question about a specific text span in a given sentence such that the answer is not in the text.

Let me give you an example: Sentence: The Obama administration is developing additional screening protocols for airline passengers both overseas and in the United States to control infectious diseases such as Ebola, President Barack Obama said Monday .<sep>Span: Obama administration
The answer to this example can be: What was the duration of the Obama administration?
Here is why: It is an inquisitive question based on the specific span of the sentence.

OK. solve this:
Sentence: Geologist Erin Argyilan has in the last 10 months studied sediment , analyzed wind patterns and mapped terrain , but she hasn ’ t solved the mystery of the holes that appear and vanish in the beige sands of Mount Baldy at Indiana Dunes National Lakeshore .<sep>Span: studied
Answer:
How did Erin Argylian study this sediment?