The word "prehistory" implies "before writing existed". There are no "written sources" from that time.
Why would an organic chemist prefer to read primary sources about experiments In her field rather than secondary sources
Oral sources refer to information or knowledge that is transmitted through spoken words or oral traditions, rather than written down or recorded in any written form. These sources can include personal stories, myths, legends, folklore, and historical accounts that have been passed down through generations by word of mouth. Oral sources are important in understanding cultures, histories, and narratives that may not be recorded in written documents.
Sound generalizations can accommodate a variety of complex sources.
non conventional energy sources are those energy sources which are exposed to use from modern technologies advancements ; rather than the normal use of conventional fuels as energy sources like gas or oil
Online sources are less reliable, in general, than print sources.
When you find something out from a different source rather than writing, for example word of mouth.
Mark Clifton has written: 'They'd rather be right' 'They'd rather be right' -- subject(s): Accessible book
Some reasons that East Asian countries are turning to alternate power sources, rather than oil are expenses and changes in culture, economies, and the way that the people live.
Archaeologists use a datum point to establish a consistent reference point for all measurements during excavations. This helps ensure accuracy and precision in recording the vertical and horizontal positions of artifacts and features. By having a fixed point of reference, archaeologists can maintain spatial relationships within the site.
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Energy sources plays a very important role in the economic development of a country. A country having well developed sources of energy has a better chance of development rather than a country having less energy sources.
In the world of Archaeology, archaeologists follow what is essentially the scientific method in their research and excavations. This can be very tedious and hands on, but the types of dangers in this field are not accurately portrayed in Indiana Jones and the people who are portrayed as archaeologists in Indiana Jones are not what one would call scientific in their pursuits. Instead, the characters who are acting as archaeologists in Indiana Jones follow the pattern of one who is seeking to obtain things of intrinsic value, in much the same way as a treasures seeker or antique dealer.