Let the heaven and earth praise him - All things; all above and all below.
The seas - The waters - the oceans. This is in accordance with what often occurs in the Scriptures, when all things, animate and inanimate, are called on to praise God. Compare Psalms 148:1-14.
And everything that moveth therein - Margin, as in Hebrew, “creepeth.” Compare the notes at Psalms 8:8. See also the notes at Isaiah 55:12.