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In social sciences there are many key concepts and terms that are crucial for students to know and understand.

Often it can be hard to determine what the most important social sciences concepts and terms are, and even once you’ve identified them you still need to understand what they mean.

As the Earth's upper atmosphere is bombarded by cosmic radiation, atmospheric nitrogen is broken down into an unstable isotope of carbon - carbon 14 (C-14).

The unstable isotope is brought to Earth by atmospheric activity, such as storms, and becomes fixed in the biosphere.

Two recent theses have focused on the application of OSL to the dating of medieval buildings; Sophie Blain (now a postdoc at the University of Liege) investigated the use of brick in early medieval buildings in SE England and Normandy (Dual Ph D with Univ.

Different researchers have applied a variety of absolute dating methods directly to petroglyphs or to sediments covering them, including AMS (accelerator mass spectrometry) radiocarbon, cation ratio, amino acid racemization, OSL (optically stimulated luminescence), lichenometry, micro-erosion and micro-stratification analysis of patina. These techniques have yielded mixed results in terms of reliability and feasibility, but, in any case, none has been applied to date in Saudi Arabia.

It is hoped that absolute dating will be successfully implemented in the future in this region.

All dating methods have limitations and can be complicated by turbation, or mixing, of layers by human or natural actions.

Multiple dating methods are usually required before dates are accepted.




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