But at your rebuke the waters fled,
at the sound of your thunder they took to flight;
they flowed over the mountains,
they went down into the valleys,
to the place you assigned for them.
You set a boundary they cannot cross;
never again will they cover the earth.
There are two ways to interpret the actions that occur in the passage under consideration depending on how verse 6 is translated from the original Hebrew to English. One version tells us that the waters rose over the mountains and descended into the valleys, which could be an allusion to the hydrological cycle and the other way to translate this verse tells us that the mountains rose and valleys descended probably referring to the orogenic processes by which the mountain ranges took the shape we see today in many parts of the world. It does not matter if King David was talking about hydrology or orogeny since the message of the passage is the authority and dominion of God over his creation, regardless of the manner in which things take place. Both physical processes are among the many tools available to God to create and transform creation. As the Master Teacher, he has at his disposal brushes, spatulas, canvas, oils, acrylics, watercolors, crayons, pastels, charcoals, and so to shape his masterpiece.
He who has the power to create a universe of universes with dimensions and shapes that we are unable to understand is the same one that has sought us to be his children. He is the same one that speaks to our hearts by his word in a language that only our heart can understand. With God nothing is impossible. His wishes are commands to creation and creation joyfully obeys without questioning and without delay. There is not a single problem in the world that God can not solve. If you really need something that looks impossible to achieve or accomplish, take it to God in prayer and let him act. Put your trust in the One who will not disappoint you nor forsake you. Come to the Lord Jesus and you will have everything you really need. To God alone be the glory!