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The Stone Age

Horizontales
The combination of copper and tin
A domesticated plant grown in large quantities
To change to fit a new situation
A long period of cold temperatures that change the world climate
Living naturally in groups
A slow moving mass of ice
"The cradle of civilization"
A highly developed society
The practice of farming
To heat rock in order to remove the metal in contains
A system for supplying water to crops
The first domesticated animal
Verticales
To change slowly over time
A long period of time with little or no rain
Early people worshipped their spirits
People who move from place to place with no permanent place to live
The study of humans
The first metal the humans smelted and used
To breed an animals to live in close association with humans
The study of societies of the past by examining objects found in the ground
The first domesticated herd animals
The exchange of goods or services