The Psalmist continues the theme of ‘God the Creator’. The focus now shifts to the second and third day of creation that describes how the land surfaces of earth were first created for life. The point is to show gratitude to God for creating a place where we can live. We need to learn to appreciate the world as He created it.
The truth that is expressed in verse 5b, it should not be removed for ever, is a poetic way of saying God put the earth where He did and it can’t move from where He wanted it to exist, that is, it will not totter and fall off balance. God has mightily hung the earth on its axis in the universe with a delicate balance that is necessary for its existence.
 Thou coveredst it with the deep as with a garment: the waters stood above the mountains.
Genesis 1:6 describes land that “surfaced” from the water. The idea is when the earth was first made, the original surface was all water and then God created land for life to exist. Why does God want us to know that when the earth was first made, it was “all water first” and then land? Water sustains our life and land appeared for our benefit.