The voice of thunder declares my arrival; The rainbow announces my departure

The voice of thunder declares my arrival;
The rainbow announces my departure.
I am like earthly life, which begins at
The feet of the mad elements and ends
Under the upraised wings of death.
(a) How is rain similar to earthly life?
(b) Which word in the extract is a synonym of ‘declares’?
© What are the upraised wings of death for rain?
or
(a) How are arrival and departure of the rain announced?
(b) How is the rain like earthly life?
© What is the opposite of ‘earthly’?

(a) The rain is short-lived, as is man’s life on Earth. It comes and goes just as man is born and dies. Thus, both rain and earthly life are similar.
(b) The word is ‘announces’.
© The upraised wings under which rain dies are the wings of the wind that blows the rain to stop.
(a) The arrival of the rain is announced by the sound of thunder. The departure of the rain is announced by the appearance of a rainbow.
(b) The rain is short-lived, as is man’s life on Earth. It comes and goes just as man is born and dies. Thus, both the rain and the earthly life are similar.
© ‘Heavenly’ is opposite to ‘earthly’.