1)
Seeing as the Paroches was vertical See Sifsei Chachamim) why does the Torah refer to it as "Paroches ha'Masach" implying 'which covers'?
1.
Rashi: Because it separated the Kodesh Kodshim from the Kodesh, and whatever serves as a protection, whether from above or at the side, is called a 'Masach'. 1
1
As we find in Iyov, 1:10 and in Hoshe'a, 2:8 (Rashi).