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Explosions of ash completed this long eruptive period.

Afterwards, Ngauruhoe steamed almost continuously, with many small ash eruptions8 (Figure 5).

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Have you ever wondered how it's possible to so accurately date ancient artifacts?

The first lava eruption seen by Europeans occurred in 1870.3 Then there were ash eruptions every few years until a major explosive eruption in April–May 1948, followed by lava flowing down the northwestern slopes in February 1949.4 These flows are still distinguishable today on the northwestern and western slopes of Ngauruhoe (Figure 4).

The 18 August flow was more than 18 m (55 feet) thick and still warm almost a year after congealing.

It might take a millisecond, or it might take a century. But if you have a large enough sample, a pattern begins to emerge.

So let’s take a closer look at these methods and see how reliable they really are.

Each chemical element, such as carbon and oxygen, consists of atoms unique to it.

Geologists, paleontologists, archeologists, and anthropologists use a statistical process like radioactive isotope decay to date objects through a method called radioactive dating (also known as radiometric dating).

To learn more about that method, check out the geology science project How Old Is That Rock?