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Meghan Read

on 13 November 2014

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Transcript of Rangitoto

Surface features of Auckland
Due to volcanic activity in the Auckland region over the years, the surface features of Auckland have changed.
Firstly the formation and eruptions of volcanoes have greatly effected the enviroment making the wildlife and plantlife adapt to the geographical changes. Secondly, in the Auckland Region alone there are
volcanoes due to the hot spot activity. Also craters, lakes and volcano collapses have changed the surface features of Auckland.
Surface Features of Rangitoto
Over the period of Rangitoto's formation several surface features have appeared on Rangitoto due to eruptions or tectonic activity.
Lava flows- the molten rock that flows from the erupting vent. The distance znd the speed it travels down the volcano will depend on 1) the type of lava erupted and the viscosity level 2) the steepness of the ground 3) whether the lava flows through a lava tube or not 4) the rate of the lava production at the vent
Moat and Scoria
Lava caves/tubes
Rocky Shore- this is one place where basalt rock is found after the eruption.
Internal Proccesses that formed Rangitoto
Volcanoes are formed in several different ways. There is subduction volcanoes, hotspot volcanoes and various other ways. The Auckland region of New Zealand is different to quite a lot of volcanic regions. The Auckland volcanic field has 49 volcanoes that are entirely fuelled by basaltic magma unlike other New Zealand volcanoes that have been formed through subduction or the eruption of viscous andesite magma generated at the active boundary of the pacific and Australian plates.Rangitoto was formed through hot spot activity unlike a lot of other New Zealand volcanoes that have been formed through subduction. The hot magma pushed through the crust of the earth creating a eruption that formed the shield volcano Rangitoto.
Thank you!
The history behind the Mountain
Rangitoto is one of the first volcanoes to have their eruption seen by humans, even though it is one of the youngest and largest volcanoes in the Auckland Volcanic Region. To the Europeans, the volcano was called Rangitoto but the Maori name for it was Ngā Rangi-i-totongia-a Tama-te-kapua ('The days of the bleeding of Tama-te-kapua') because there was many battles fought on the shore
Ngā Rangi-i-totongia-a Tama-te-kapua ('The days of the bleeding of Tama-te-kapua')
External processes of Rangitoto
 Water and wind
- The water and the wind have weathered the basalt and scoria rock into tiny particles like sand. This is another way the environment of Rangitoto has changed.
 Plant and animal erosion
- Animals cause erosion when they walk over of soil as they are compacting it. Also another way is overgrazing. Pests have destoryed the environment killing off important vegetation etc. on Rangitoto.
 Human activity
- Harmful pollution, machinery, and litter have changed the enviroment of Rangitoto.
Sea level changes
The sea level changes have caused the beach to have changed and the landscape and environment have also been affected.
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