which is known for its

[dead end]

Why is this sentence correct?

During the summer months, several thousand people a day visit the park, which is known for its waterfalls and rock formations.

Shouldn't it be this way?

During the summer months, several thousand people a day visit the park, for whose waterfalls and rock formations is known.
SAT Improving Sentences Practice Question 44: Answer and Explanation_cracksat.net

 

[natkretep]

You still need something to represent the subject. So even if you want the preposition to come first, you need to add it.

During the summer months, several thousand people a day visit the park, for whose waterfalls and rock formations it is known.

In the original version, it has been replaced with which. The original version reads more naturally.

 

[dead end]

Is this sentence correct?

The room whose roof is darker than its walls is mine.

 

[Hermione Golightly]

This is not a natural way of expressing the idea, although it might be grammatically correct. (I guess you might mean 'ceiling' - a roof is outside.)
It's not good to have 'is mine' at the end of the sentence after a long relative clause.
I'm not too happy with 'whose' used for objects, although it's common usage in casual talk.
The best way to express this idea is to use a construction like this:
"My room is the one with the roof darker than the walls."
"The room that's mine has a roof darker than its walls."

 

[dead end]

This is not a natural way of expressing the idea, although it might be grammatically correct. (I guess you might mean 'ceiling' - a roof is outside.)
It's not good to have 'is mine' at the end of the sentence after a long relative clause.
I'm not too happy with 'whose' used for objects, although it's common usage in casual talk.
The best way to express this idea is to use a construction like this:
"My room is the one with the roof darker than the walls."
"The room that's mine has a roof darker than its walls."

Thanks
So in adjective clauses it is possible to have a possessive adjective?

 

[Hermione Golightly]

During the summer months, several thousand people a day visit the park, for whose waterfalls and rock formations is known.

I propose ' ... visit the park that is known for its waterfalls and rock formations.' We're not supposed to rewrite but sometimes there's such a mess that it's the only helpful thing to do.

So in adjective clauses it is possible to have a possessive adjective?

I wouldn't call that an adjective clause, but a possessive adjective is like any other.
The room is dark.
That room is mine.

 

[dead end]

I wouldn't call that an adjective clause, but a possessive adjective is like any other.
The room is dark.
That room is mine.

What would you call it??

 

[Hermione Golightly]

I'd call it the subject complement. How can it be a clause? Some people here are far better grammarians than I am, so maybe we'll get better explanations.