One year in the life of a teenager can feel like an eternity. The intensity of the fleeting romances, the wild swings between happiness and despair, the thrilling yet uneasy anticipation of a future that seems simultaneously imminent and distant — it’s a wonder that we come out of adolescence intact. But that time shapes who we become, and with her feature debut, Ukrainian filmmaker Kateryna Gornostai chronicles that all-important pre-graduation year, where nothing — and everything — matters. Utilizing non-professional actors, and blurring the lines between documentary and fiction, “Stop-Zemlia” is a sympathetic portrait of the tidal forces of teenagehood. Yet, despite the film’s quiet sprawl and yearning ambition, Gornostai’s painstakingly observant eye never uncovers fresh insight into the thrumming heart of that transformative moment.