Because its almost in the centre (middle) of all the keys and the note is a c =)
sorry but its quite obvious ........... because its a note c and its in the middle
yes, the middle line of the alto clef is a c
the middle "c" is used for everything even for when u are taking a shower!!!! :P
Just as middle C is on the first ledger line down on the treble clef, it is on the first ledger line up on the bass clef.