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Adjective
This is a type of introductory clause that is called a dependent clause. It is basically one that help to provide some background information.
adverbial clause
adverbial clause
Adverb clause
That is an independent clause. It would be a subordinate clause if you said, "I would like to know who...."
Noun.
adjective
The clause "that I found in my book" is a relative clause, specifically an adjective clause. It provides additional information about the noun "book" by describing which book the speaker found.
The clause is an adverb.
adverb
adverb