Chemical: can burn
physical: hard
Social structure is a complex topic and involves and revolves around the basic frameworks we usually use to describe the common ways how people bond into hierarchically structured organizations, with these being either formal or informal.
Answer:
The Eastern Orthodox forbid icons, where the Roman Catholic Church use figures of Mary and saints.
Explanation:
Icons played a significant role in the disagreement between the Eastern Orthodox Church and Roman Catholic Church. The split happened when Constantinople declares its Eastern Patriarch and a separate church. Icons cause controversy among the people because of their different faith and believe. Pope Leo IX came to Constantinople to meet the patriarch to solve the dispute of religion but both excommunicated each other.
The star is pinpointing Finland. None of the above geographical features are located in Finland.