How many seasons are there in this world?

[Silverobama]

I was chatting with my student. She was reading an article with the title "Seasons". I asked the question "How many seasons are there in this world?"

Is the italic sentence natural?

 

[tedmc]

Is there another world?

 

[emsr2d2]

I was chatting with one of my students. She was reading an article with the title called "Seasons". I asked the question her "How many seasons are there in this world?"

Is the italic sentence natural?

See above.

 

[Silverobama]

Is it also natural to ask "How many seasons are there in the world?" and "How many seasons are there in a year?"

 

[5jj]

Is it also natural to ask "How many seasons are there in the world?

No.

and "How many seasons are there in a year?"

Yes.