We do that sometimes, when the noun is countable but there are too many "items" to count them all really:). Here, the mountains are like a lot or a mass. "Mycket berg" seems slightly coloquial though and "många berg" should definitely be accepted. If it's not, you should report it.
Thanks for the answer. It was a "Mark all correct translations" question, and "många berg" was accepted, but I didn't know that I should have marked "mycket berg" as well...
Why does it mark me incorrect when I use fjällen instead of berg? I thought they both meant "mountains"? They both translate that way in other exercises.
Plural version of "fjäll"? I tried looking it up but couldn't find a contemporary version (just the outdated "fjällar") does it still have a plural form or should we just use "berg" when it comes to the plural?
I am confused why “många” has to be checked here… Duolingo is sometimes very strict about translations, but not here… Until now I figured that “a lot of” = “mycket” and “many” = “många”. I understand that the meaning of the sentence does not change, but these are NOT the exact same words.
"Många" is the default for countable nouns like "berg" (ett berg - flera berg), so it should be more confusing with "mycket berg" :). See my post above.