25. Prehistory: the time before humans left written records

26. Obsidian: glass found near volcanoes.

27. Weapons: things used to hurt someone

28. Chop: Cut into small pieces

29. Camp: an outdoor living place

30. Decay: get ruined

31. Embers: Glowing remains of the fire

32. Period: Time

33. discovery: find something for the first time

34. cook: make food

35. nomads: people who move from place to place looking for food

36. Settle: to stay in one place and not move around

37. seeds:

38. harvest: to pick crops for eating

39. protect: keep something safe

40. scholars: people who study for a long time