Although the author claims that he love meteorites, but phases
like rapid degradation and violent cleansing reflects the
destructive side of Nature. Well nothing is perfect.
But from line 6 onwards, there seems to be twist in the poem to a
more positive turn. Nature represent by the shiny pebble is in the
palm of a boy. This symbolize the fate of Nature, to a certain
extend, is now in the hand of the younger generation.
Excellent poem. 
~remind me of MIB~ 