because in a noun (nominal) clause and because in an adverbial clause ?

0Hi! Was just wondering whether somebody could explain to me what is the difference between the two 01i00because02i00-clauses in (1) and (2):02br
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00 (1) He punched the wall 01i00because he was angry02i02br
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00 (2) It is 01i00because he is angry02i02br
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00Is it that the 01i00because02i00 clause in (1) is an "adverbial clause" and that the 01i00because 02i00clause in (2) is a noun or nominal clause? 02br
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00 It's just that I've read countless times that 01i00because02i00 introduces an adverbial clause, and never seen it written that 01i00because02i00 can be part of a noun clause.02br
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00THanks for the help,02br
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00 Luke0-