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Inscriptions, distinctive markings, and historical documents can all offer clues to an artifact's age.And if the artifact is organic—like wood or bone—researchers can turn to a method called radiocarbon dating.

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.Explosions of ash completed this long eruptive period. Cannon-like, highly explosive eruptions in January and March 1974 threw out large quantities of ash as a column into the atmosphere, and as avalanches flowing down the cone’s sides.Blocks weighing up to 1,000 tonnes were hurled 100 m (330 feet).However, the most violent explosions occurred on 19 February 1975, accompanied by what eye-witnesses described as atmospheric shock waves.