AS 91189 Investigate geological processes in a New Zealand locality.

AS 91189 Investigate geological processes in a New Zealand locality.

AS 91189 Investigate geological processes in a New Zealand locality.

AS 91189 Investigate geological processes in a New Zealand.

 

132,000 years of violent volcanic activity then they built Ash Pit Road (Prezi).

Tephra deposited from multiple eruptions in the Taupo volcanic Zone.The history of the area is written in layers of ash revealed in a cutting on Ash Pit road close to Rerewhakaaitu. 

The land and Lakes Field trip document is a good resource and you should flick through it and highlight sections that deal with basalt, rhyollite, the Taupo and Tarawera eruptions. You will come across a section on the road cutting on Ash Pit road.

 

Skim read to begin with and don’t get bogged down in detail

The Tarawera eruption.

This is a useful resource on the Tarawera eruption

The Okataina Volcanic Complex

GNS Science, TE PU AO iis a government website with lots of Earth and Geoscience resources

The Okataina Volcanic Complex

The Okataina Volcanic Centre is part of The Taupo Volcanic Zone ( TVZ ).

 Plinian eruptions send huge volumes of ash into the stratosphere and this can have global implications. Individual ash deposits show a fine grained layer at the top indicating that the eruption faded after the initial explosive event

The Okataina Centre includes the large young volcanoes of Tarawera and Haroharo, with others at Mt Edgecumbe, Okareka and Rotoma

 

New Zealand volcanoes such as Ngauruhoe and White Island, have relatively small eruptions every few months or years.

Eruptions in the Okataina volcanic complex, are 100 to 10,000 times larger than those at White Island or Ngauruhoe. 

Okataina Complex volcanos  have displayed eruption intervals between 700 and 3000 years.

There have been 12 devastating Plinian eruptions in the period between 31 and ∼43 ka. The pyroclastic deposits total 77 km3. The biggest eruptions in the region were extremely destructive burying areas of up to 4,200 km2 to at least a depth of 1 meter.

The Auckland Region covers an area of 4894 km2 . 

 

 

The Kaharoa eruption and The Great Famine of 1315-1317

 

 

The onset of the Great Famine coincided with the end of the Medieval Warm Period. Between 1310 and 1330, northern Europe saw some of the worst and most sustained periods of bad weather in the entire Middle Ages, characterized by severe winters and rainy and cold summers. The Great Famine may have been precipitated by a volcanic event,[3] perhaps that of Mount Tarawera, New Zealand, which lasted about five years. (Wikipedia)

[embeddoc url=”https://johnwest.edublogs.org/files/2017/10/kaharoa-eruption-2hgafjt-29wfwyy.pdf” d

Intra Plate Volcanics, Hot Spots

Intra Plate Volcanics, Hot Spots

Intra Plate Volcanics, Hot Spots

A sunny ferry trip to Rangitoto Island

 

 

 

 

A broad gently sloping cone. Rangitoto is a shield volcano formed from fluid basalt lava flows

Where does all the basalt come from?

…..mid ocean ridges ridges to begin with then it is subducted under the east coast of the North Island

  • Most basalt is produced at mid ocean ridges.
  • Basalt produced at mid ocean ridges is rafted away as oceanic crust is formed.
  • The process of subduction produces mainly basaltic magma
  • This basalt is not rafted away from the site of eruption.
  • The subducting slab comprises of basalt and gabbro with a thin veneeer of seafloor sediment.
  • Water and other fluids move into the overlying “mantle wedge” where they promote partial melting.
  • The resulting basalt magma makes its way into the continental crust
  • The basalt can end up feeding large volanos such as Mount Ruapehu.
  • Broad gently sloping cones such as Auckland’s Rangitoto Island, Lyttleton and Akaroa on the Banks Peninsula.
  • In the Auckland region steep sided scoria cones are also formed by the process of fire fountaining.

 

 

 

 

  • Most basalt is produced at mid ocean ridges.
  • Basalt produced at mid ocean ridges is rafted away as oceanic crust is formed.
  • The process of subduction produces mainly basaltic magma
  • This basalt is not rafted away from the site of eruption.
  • The subducting slab comprises of basalt and gabbro with a thin veneeer of seafloor sediment.
  • Water and other fluids move into the overlying “mantle wedge” where they promote partial melting.
  • The resulting basalt magma makes its way into the continental crust
  • The basalt can end up feeding large volanos such as Mount Ruapehu.
  • Broad gently sloping cones such as Auckland’s Rangitoto Island, Lyttleton and Akaroa on the Banks Peninsula.
  • In the Auckland region steep sided scoria cones are also formed by the process of fire fountaining.

Year 10, Elements and the periodic Table Quiz

Year 10, Elements and the periodic Table Quiz

Year 10, Elements and the periodic Table Quiz

Work through The Introduction to the Periodic Table Prezi then do the quiz to check your understanding.

By the end of this unit you should know:

  • what the atomic number and mass number of an element is.

  • how elements are arranged on the periodic table.

  • what Periods and Groups are.

  • the physical and chemical properties of the group 1 metals.

  • the physical properties of group 17 elements.

  • the physical properties of group 18 elements

  • that sodium and chlorine react violently together.

  • that elements in the same group have similar properties. WHY!

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