Lava rock dating
Mt Ngauruhoe is thought to have been active for at least 2,500 years, with more than 70 eruptive periods since 1839, when European settlers first recorded a steam eruption.In some circumstances however, a flow may encase a small amount of plant material before it is entirely incinerated.Starved of the oxygen required for combustion, these bits of organic material are preserved inside the cooling lava.Relative- age dating compares past geologic events based on where objects appear relative to one another in layers, or strata, of rock.
In contrast, absolute-age dating provides an accurate estimate of an object's actual age.
It is not as well publicized as its larger close neighbour Mt Ruapehu, which has erupted briefly several times in the last five years.
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