In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.

[EX Q]: Ha Long Bay is located in northeastern Vietnam, from E106 ° 55' to E107 ° 37' and from N20 ° 43' to N21 ° 09'. The bay stretches from Yen Hung district, past Ha Long city, Cam Pha town to Van Don District, bordered on the south and southeast by Lan Ha Bay, on the north by Ha Long city, and on the west by Bai Tu Long Bay. The bay has a 120 km long coastline and is approximately 1,553 km2 in size with about 2,000 islets. The area designated by UNESCO as the World Natural Heritage Site incorporates 434 km2 with 775 islets, of which the core zone is delimited by 69 points: Dau Go island on the west, Ba Ham lake on the south and Cong Tay island on the east. The protected area is from the Cái Dăm petrol store to Quang Hanh commune, Cam Pha town and the surrounding zone.
[EX A]: is halong bay in north or south vietnam

[EX Q]: The National League of Families POW / MIA flag, also known as the POW / MIA flag, consists of a silhouette of a prisoner of war (POW) before a guard tower and barbed wire in white on a black field. 'POW / MIA' appears above the silhouette and the words 'You Are Not Forgotten' appear below in white on the black field.
[EX A]: what does the message at the bottom of the pow mia flag mean

[EX Q]: A major environmental concern known as topsoil erosion occurs when the topsoil layer is blown or washed away. Without topsoil, little plant life is possible. The estimated annual costs of public and environmental health losses related to soil erosion exceed $45 billion. Conventional agriculture encourages the depletion of topsoil because the soil must be plowed and replanted each year. Sustainable techniques attempt to slow erosion through the use of cover crops in order to build organic matter in the soil. The United States alone loses almost 3 tons of topsoil per acre per year. This is of great ecological concern as one inch of topsoil can take between 500 and 1,000 years to form naturally. On current trends, the world has about 60 years of topsoil left.
[EX A]:
when does top to bottom erosion take place