This is the 3502nd most frequent Spanish word.
formada
"Formada" in English means "formed" or "shaped."
The word 'formada' here is used to indicate that the line is organized or composed of individuals.
La fila estaba formada por personas de todas las edades.
The line was formed by people of all ages.
In this context, 'formada' means created or developed, referring to the opinion established by the students.
La opinión formada por los estudiantes fue muy favorable.
The opinion formed by the students was very favorable.
Here, 'formada' is used to describe the rock as being composed of multiple layers.