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For example, the element Uranium exists as one of several isotopes, some of which are unstable.

When an unstable Uranium (U) isotope decays, it turns into an isotope of the element Lead (Pb).

The igneous activity that produced such intrusions...

...calculation was based on the assumption that the substance of the Earth is inert and thus incapable of producing new heat.

However, the crater number relation must be calibrated against something with a known age.

To measure the passage of long periods of time, scientists take advantage of a regularity in certain unstable atoms.

But what exactly does it mean for something to be radioactive? Radioactive atoms have unstable nuclei, and they will eventually release subatomic particles to become more stable, giving off energy—radiation—in the process. This is an enormous branch of geochemistry called Geochronology. It is an accurate way to date specific geologic events.For instance, a small amount of carbon exists in the atmosphere as radioactive carbon-14, and the amount of carbon-14 found in fossils allows paleontologists to determine their age.Atoms of each element contain a characteristic number of protons.

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It has a maritime and industrial tradition including boat-building, sail-making, the manufacture of flying boats, the hovercraft, and Britain's space rockets.