luw'  (loo)
a conditional particle; if;; by implication (interj. as a wish) would that! -- if (haply), peradventure, I pray thee, though, I would, would God (that).
that thou wouldest rend
qara`  (kaw-rah')
to rend, literally or figuratively (revile, paint the eyes, as if enlarging them) -- cut out, rend, surely, tear.
the heavens
shamayim  (shaw-mah'-yim)
air, astrologer, heaven(-s).
that thou wouldest come down
yarad  (yaw-rad')
to descend; causatively, to bring down (in all the above applications)
that the mountains
har  (har)
a mountain or range of hills (sometimes used figuratively) -- hill (country), mount(-ain), promotion.
might flow down
zalal  (zaw-lal')
to shake (as in the wind), i.e. to quake; figuratively, to be loose morally, worthless or prodigal -- blow down, glutton, riotous (eater), vile.
at thy presence
paniym  (paw-neem')
the face (as the part that turns); used in a great variety of applications (literally and figuratively); also (with prepositional prefix) as a preposition (before, etc.)