instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
Passage: An anticline is a fold that arches upward. The rocks dip away from the center of the fold ( Figure below ). The oldest rocks are found at the center of an anticline. The youngest rocks are draped over them at the top of the structure. When upward folding rocks form a circular structure, that structure is called a dome . If the top of the dome is eroded off, the oldest rocks are exposed at the center. Answer: anticline
answer:
What is the term for a fold that arches upward?

question:
Passage: The power of the ocean modifies landforms by erosion and deposition. Landforms modified by both erosion and deposition are seen in this photo. The cliff is being eroded by incoming waves. The beach is being created as sand is being deposited. Answer: erosion and deposition
answer:
By what processes does the ocean modify landforms?

question:
Passage: When light rays converge behind a lens, a real image is formed. Real images are useful in that you can place photographic film at the physical location of the real image, expose the film to the light, and make a two-dimensional representation of the world, a photograph. Answer: a photograph
answer:
What can be formed by converging light rays behind a lens, onto a piece of film?