Radiometric dating should be what they use
To answer you question, The two main ingredients are Heat and coolness.
Answer:
Explanation:
Human geography studies the relationships between people and the environments in which they live. Within the field of human geography there are five main areas of study. These areas are economic geography, cultural geography, political geography, urban geography and environmental geography. In Canada, human geographers might study the status of Indigenous languages or differences between rural and urban Canadians, among many other topics.
The spirits of the ancestors, animal spirits too
During the Cenozoic era,mountain building in western North American was caused by tectonic activity.
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