Problem: What term is applied to the fusion of Roman, Greek and Persian cultures that reached its peak after the 4th century AD during the reign of Justinian, and is seen in mosaics, frescoes, metal work, ivory carving and silk weaving?
Answer: byzantine

Problem: Burins, bifaces and scrapers are ancient artefacts made of what?
Answer: stone

Problem: What name is given to the huge growths of algae sometimes seen in polluted lakes and rivers?
Answer: bloom

Problem: In which year did the Japanese attack Pearl Harbor?
Answer:
1941