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12 And the earth brought forth grass, and herb yielding seed after his kind, and the tree yielding fruit, whose seed was in itself, after his kind: and God saw that it was good.
'To open,' as in Revelation 9, signifies communication and conjunction.
(References: Apocalypse Explained 537)
16 The heaven, even the heavens, are the LORD's: but the earth hath he given to the children of men.