This is the 1392nd most frequent Polish word.
społecznych
"Social" (relating to society or community).
The word 'społecznych' is used as an adjective modifying the word 'nauk,' explaining their association with social studies.
Studenci uczą się o różnych aspektach nauk społecznych.
Students are learning about various aspects of social sciences.
Here, 'społeczne' describes the type of issues, indicating that they are related to the community or society.
Problemy społeczne wymagają współpracy całego społeczeństwa.
Social issues require the cooperation of the entire society.
In this example, 'społeczne' defines the type of ties, referring to those which exist within and are related to social relationships.