1:9a) Coalesce and co-operate with and thus strengthen one another, cf. Psalms 33:7 & 89:9f. This too seems to be a creaturely reflection of God-Triune.
1:9b) Into one world-ocean surrounding all the many continents then arising from beneath it (Psalm l04:5f). This one world-ocean and many continents is yet another reflection of the one God and the many Persons within the Trinity Who made this world-ocean and these continents. Cf. Genesis 1:1a,9b with Matthew 28:19 & First Corinthians 12:3-7 & 12:12-14 & 12:20).
1:9c) Let the land surface of the Earth be seen or (pro-)vided, cf. Genesis 1:4b, as divinely fore-ordained! Jeremiah 5:22 & Acts 15:18.