Flotsam and jetsam

Flotsam and jetsam
On a changeable ocean-top,
Undulating and groaning
Under all
The jets, ships and icebergs,
So much smaller than the titanic,
And at the mercy of the moon.
The breezes and currents
Pushing and pulling
Without consultation.
Possibly its some trash,
Maybe a tasty morsel
To be swallowed
Without hesitation.