A magazine I was reading today had this:
"Escriba las respuestas debajo."
...which I take to mean, "Write the answers below."
It also had this:
"Escriba el nombre del escritor o escritores de los libros biblicos que aparecen abajo."
...which I take to mean, "Write the name of the writer or writers of the Bible books that appear below."
So in one case (if my translations are correct), the word "below" is written "debajo" and in the other case the same word is written "abajo."
Why the difference?