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Carbon Dating

Across
A barrier of gasses surrounding the earth
An element, co2
Smallest unit of mass
Finding the age of things
Something old that can be dated
Element that forms organic compounds
Estimating age of something
Chemical element symbol is N
A person who studies human history
Down
Estimate the age of by radiocarbon dating
Breaking down
Oldest something can be dated
People who use carbon dating
Part of an atom
Phoaphorescence produced by the heating of a substance
Carbon 14 was developed by him
Remains if an impression of a prehistoric organism
How old something is
A highly energetic atomic nucleus
Living thing