12. Archaeologist: scientists who find and study things that are left behind

13. Artifacts: something made by a person (weapons, tools, jewelry)

14. Pottery: things that are made from clay

15. Anthropologists: people who study how people act

16. Earthquake: when the ground shakes

17. Calendar: a list of days, months and years

18. jewelry: things that people wear around their necks and ears

19. Christians: people who follow Jesus Christ

20. Jesus: Prophet Issa in Islam; the founder of the Christian religion.

21. B.C.: Before the birth of Jesus Christ

22. A.D.: After the birth of Jesus Christ

23. Gregorian Calendar: the calendar that uses A.D and B.C

24. Lunar Calendar: calendar that uses the moon to count the days.