Students (2) Science--Study and teaching (2) Students (2) monde (1) enseignement (1) enseignement secondaire (1) science (1) établissement scolaire (1) recherche (1) région (1) projet (1) plomb (1) analyse (1) abords (agglomération) (1) Brésil (1) Education (Secondary) (1) Context (1) Teaching (1) Teachers (1) Struggle (1) Science (1) School children (1) Research (1) Progress (1) Percentage (1) Nature (1) Literacy (1) Legal documents (1) Learning (1) Lead (1)