Shadowgate - The Riddles

The solution to Shadowgate was given in Issue 1 of SynTax but the
answers to the riddles set by the Sphinx weren't given fully or
explained. For anyone who wants to know, here is the complete
list:

I at fires attend, am a kitchen friend.
When my nose I blow, how the embers glow.
When the wind compels, how my body swells.
     Answer - bellows. "Operate/bellows/on sphinx"

First I was burnt, then I was beaten,
Then I was drowned, then I was pierced with nails.
     Answer - horseshoe. "Operate/horseshoe/on sphinx"

It has towns but no houses,
It has forests but no trees,
It has rivers but no fish.
     Answer - map. "Operate/map/on sphinx"

Long neck but no hands,
Made of wood from a forest's nest,
A hundred legs and I cannot stand,
Against a wall I rest.
     Answer - broom. Operate/broom/on sphinx"

Eyeless though I may be, thro' me once a man did see.
My form once thoughts did hold,
Now I'm empty, white and cold.
     Answer - skull. "Operate/skull/on sphinx"

If you look at me, I look at you.
You look with eye but I've none but your two.
I speak with no voice when you ordain,
For yours is the voice, my lips open in vain.
     Answer - mirror. "Operate mirror on sphinx"

Out of interest, once the sphinx has asked all the riddles, it
vanishes.