In CG- or cel-animated films, every shot is planned in small sketches. Most effects-heavy live action films are also extensively boarded. The storyboards not only help plan the cinematic art, but they also serve as the director’s map for how all the separate elements will fit together.
Many films now use digitally animated storyboards or cinematics to allow the director and the effects supervisor to give a semblance of how the parts of the scene will move.
I did these storyboards in 1992 for a contemplated TV ad spot for the Dinotopia book. The ad was never produced. The idea of a skeleton rising from the earth is based on the classic story from Ezekiel of the dry bones lifting up and coming to life.