Geological dating radioactive isotope
c) Atmospheric carbon forms just 0.0005% of the current carbon reservoir—99.66% of the earth's carbon exists in limestone, 0.31% in oil and gas, and 0.02% in coal.
Carbon-14 comes from nitrogen and is independent of the carbon-12 reservoir.
The test probably had a yield of 250 kilotons, a US monitoring group said - much higher than official estimates.
Pyongyang claimed it was a hydrogen bomb that could be fitted into a missile - prompting global condemnation and heightening tensions over its weapons ambitions.
The simulation shows what might happen over a two-week period in the event of a blast in the middle of the Pacific Ocean.
Help us reduce the maintenance cost of our online services.Thus radioactive dating relies purely on assumptions.We could put forward the following counter arguments to the constancy of these assumptions: a) The constancy of cosmic ray bombardment might be questioned.Because your computer is running an older version of internet browser, it no longer meets the features of modern websites.You can help Amazing Discoveries reduce costs by upgrading or replacing your internet browser with one of the options below.