Genesis 1:1-31 reveals how God created from unformed and unfilled to formed and filled.  Here in Genesis 1:6-8, God forms the heavens.  The first creative work of day two is separating the waters into two parts.  At the end of day one, the earth was covered with a primeval world ocean (i.e., the deep), which the Holy Spirit intended to form and fill.  Here, on day two, the forming begins.  By cleaving the waters into the waters above and waters below, God shaped the earth into a spherical object.

From Unformed & Unfilled To Formed & Filled: Creation Day 2 - Genesis 1:6-8

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