Answer: The earth receives a certain amount of Insolation (short waves) and gives back heat into space by terrestrial radiation (longwave radiation). Through this inflow and outflow of heat, the earth maintains a constant temperature and this phenomenon is referred to as the heat budget of the earth. A heat budget is a perfect balance between incoming heat absorbed by the earth and outgoing heat escaping it in the form of radiation. Heat budget is important because it explains, why the earth neither warms up nor cools down despite the huge transfer of heat that takes place.
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Copper is the answer.
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By a mix of human and physical geographic evidence.
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Civilizations can end due to natural causes. Volcanic eruptions can be devastating for people living close to it. Checking rock age and strata with any historical references could explain. Data from ice core could indicate changes in the atmosphere. A change, such as increased drought, in regions, might end up causing food shortages and the end of civilizations.
Human evidence can provide the answers too. Migration patterns may explain this, such as the Europeans arrived in the Americas. The land has a carrying capacity. Studying the population might indicate the carrying capacity was exceeded, such as Easter Island.
Answer: You could use old documents to help you make new medicine.
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