Before the development of radiometric dating techniques


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Since its birth, these isotopes have been breaking down and releasing energy that adds heat to the planet's interior.Radioactivity also gave the history of life an absolute calendar.Julia Charlotte L Davis (born 25 August 1966) is an English comedian, actress, writer, director and producer.She is known for writing and starring in the BBC Three comedy Nighty Night (2004–2005) and Sky Atlantic comedies Hunderby (2012–15) and Camping (2016), which she also directed.

In 2016, Davis wrote, directed and starred in Camping on Sky Atlantic, this was her directorial debut.She is working on a new comedy for Channel 4 called Morning Has Broken, about a struggling daytime TV host.Nineteenth century geologists recognized that rocks formed slowly as mountains eroded and sediments settled on the ocean floor.Atoms can fuse together to create new elements; they can also spontaneously break down, firing off subatomic particles and switching from one element to another in the process (see figure, right).

While some physicists used these discoveries for applications ranging from nuclear weapons to nuclear medicine, others applied them to understanding the natural world.But they could not say just how long such processes had taken, and thus how old their fossils were.Darwin had argued that the Earth was immensely old — which gave his gradual process of evolution plenty of time to unfold.By measuring the atoms produced by these breakdowns inside rocks, physicists were able to estimate their ages (right).