The bible is written as a prophetic book. This means that when God talks He describes future events that will be part of the ongoing description of that account later in the same book. It is most evident when God speaks of the events in nature. The bible always speaks of God as a He sustains creation in causing all natural disasters.We must understand that Gods actions and mans actions are not equally important. Because God controls the choices of man that cause all the problems in history. We must describe history in the context of redemption and not in the pagan context.
As well as cause natural disasters God has also cursed the earth. This means as time goes on something that simply is not used as a resource is degenerating. Everything that God created is not only degeneration from one generation to another but also over thousands of years. It is impossible for man to keep up with the earths process of degeneration. This is why the Revelation describes the earth causing deaths in generations. In other words the curse has made the earth our enemy in the sense that it naturally degenerates and is causing diseases in the human race.
We must understand that in comparison to Gods view of us, we are completely in the dark. We cannot see all of time in every space in the universe. But God sees the hidden parts. For us to make a case that we are able to change something about us or in our world is on very shaky ground. We would need to see every molecule and the movement in time to be able to describe the reasons for the existence of all things. You see we cannot see what God is doing in the hidden and very small things.
The Psalmist is saying that God searches us. He is acknowledging that God does things in the Psalmist circumstances and on a personal nature in the Psalmist that is undetectable. We cannot even see what is going on inside our bodies. We must conclude that God does things to sustain our lives and our circumstances that we do not know about.
God designed creation before the foundation of the world. He has promised that the earth cannot be moved. Its not talking about movement in space but the foundations of the earth cannot be destroyed. God has promised that there is no man who is able to destroy the earth.This includes the control that God has over man in the amount of destruction that he could cause with the ability and the action to clean it up. In this sense Gods law that speaks death is balanced by Gods blessing over all things. Because God controls all things.