Well I am back as promised to continue the story of our amazing first week. Now where were we? Ahh yes we were in Taupo and had just visited the GNS science group. The day after that we went down to Rotorua (or Rotovegas as the locals sometimes call it) where we looked at the geothermal hot springs and the way in which society has adapted to living around them. There are certain houses which are almost on top of the springs and many of the local populace use the water to heat there houses and for bathing. This is strictly regulated though to prevent drying out the source rocks, though this wasn’t always the case and several geysers were destroyed due to overuse. We headed back to Taupo a little earlier this day in order to start some work on our presentation to the kids at Realise the Dream on Wednesday (will explain more later).
The next morning we returned to Rotorua for one of the most unbelievable mornings of my life! We took a helicopter from Rotorua all the way out across the east coast of the north island, past the bay of plenty out to White Island a little way off shore. White Island is New Zealands most active volcanic island, with many geothermal surface features. We flew out over it, getting a fantastic view of the overall structure of the island before landing in the active crater itself. It was a little alarming when we were issued with hard hats and gas masks and were told to be prepared to use them. The crater was quite large and had a collapsed side which had fallen in a previous erruption. The ground was riddled with geothermal features such as mud pools, fumeroles (gas geysers) and mineral rich hot springs. Most of the crater was coated in Sulphur (the smell was over powering), creating a beautiful combination of reds and yellows. We walked up to the crater lake which was a seething lakee of green liquid, which we were told was at a pH of -0.4!! That is superacidic, you could feel the acid in the air starting to burn any exposed skin. We also had to wear the gas masks as the hydrogen sulphide was at pretty dangerous levels. It was a real eye opener, showing just how active and dangerous volcanoes are - and the hostory of this particular volcano shows that they should never be taken for granted. Volcanoes are after all inherently unpredictable. On a lighter note we also saw some pods of dolphins on the way to White Island, playing in the ocean surf, it really was quite surreal. We spent the rest of the day in a slight more normal mode of transport as we drove up to Tongariro National Park.
Now I thought that nothing on this trip would be able to beat that day out to white island, but this next day did. We were teamed up with a fantastic guy called Jullian. He was once a teacher and was now doing educational outreach projects and was absolutely mad about ‘tramping’ (or hiking if you are from the UK). We started out at 8 and headed for Tongariro National Park, by 8:30 we had started one of the most amazing hikes of my life. Firstly we climbed the summit of Tongariro itself gaining some stunning views the volcano next door (Ngauruhoe) and a chance to play in the snow (something I had not done for many years). We then circled round the edge of what is named South Crater (though it is not actually a volcanic crater, it is a glacial valley witha number of volcanic craters in. On the way we say North Crater, which is a volcanic crater which used to contain a liquid magma lake, this then solidified to form a solid basalt crater. We also walked part way round the rim of Red Crater which is the most amazing colour I have ever seen in nature. The entire crater was a deep rich red due to an abundance of Iron III Oxide in the minerals. It also contained an intruded dyke (thin tabular intrusion of magma) in the crater. This magma had cooled from the outside inwards, meaning that the outside cooled quickly forming fine grained rock and the inside cooled slowly forming coarse grained rock. Coarse grained rock is eroded more easily than fine graned rock, so the inside had been eroded leaving this amazing hollow shell protruding from the side of the crater. The others in our party left at this point leaving Jamie and myself with Jullian to tackle Ngauruhoe. The climb up Ngauruhoe was definately a challenge, it was steep and I seemed to slip halfway back down the mountain each time I took a step. Eventually we got to the top and were rewarded with spectacular views of snow capped Ruapehu (the final volcano). By the time we got back to the car it was 9 o’clock, we had been walking for over 12 hours!! I have never felt so exhausted in my life, but that day has to be the highlight of my trip so far.
Again I have to cut this short, as we have to go and have dinner. However I promise this will be finished next time…
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