Afterwards, Ngauruhoe steamed almost continuously, with many small ash eruptions8 (Figure 5).
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.
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.2 Of course, before that, the Maoris witnessed many eruptions from the mountain.
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).
A new ad for the soft drink stars Kendall Jenner as a high-fashion model, donning a blonde wig in the midst of a protest.
It’s not clear what the protest is supposed to be about — many of the signs read general phrases like “Join the conversation” and “love.” Beckoned by one of the protesters, Jenner eventually rips off her blonde wig and joins the fray.
In the universe, argon-36 is by far the most common argon isotope, being the preferred argon isotope produced by stellar nucleosynthesis in supernovas.
2017 marks the 10th Anniversary of the Magpul PMAG. COM and Duane Liptak of Magpul in learning how the company was founded, some of their new products, and what the future holds for Magpul.
Argon is the third-most abundant gas in the Earth's atmosphere, at 0.934% (9340 ppmv).
However, Mt Ngauruhoe is an imposing, almost perfect cone that rises more than 1,000 metres (3,300 feet) above the surrounding landscape to an elevation of 2,291 m (7,500 feet) above sea level1 (Figure 3).
Eruptions from a central 400 m (1,300 foot) wide crater have constructed the cone’s steep (33°) outer slopes.