Questions: How long can volcanic ash remain in the stratosphere? A. Days B. Months C. Weeks D. Years

The answer is D: Years.

Explanation for each option:

A. Days - This is incorrect. While volcanic ash can initially be present in the atmosphere for days, it typically remains in the lower atmosphere (troposphere) for this duration.

B. Months - This is partially correct but not the most accurate answer. Volcanic ash can remain in the stratosphere for months, but it can persist even longer.

C. Weeks - This is incorrect. Volcanic ash can stay in the atmosphere for longer than weeks, especially in the stratosphere.

D. Years - This is correct. Volcanic ash can remain in the stratosphere for years. The fine particles can be carried by stratospheric winds and can have long-term effects on climate and air travel.

In summary, volcanic ash can remain in the stratosphere for years, making option D the most accurate choice.