Orb Spinner EarthCache
Hidden : 9/27/2012
Difficulty:
2 out of 5
Terrain:
1.5 out of 5

Size: Size: not chosen (not chosen)

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Geocache Description:

This earth cache is a geologically-themed artwork situated on the campus of a well-known university in Perth, Western Australia. You can answer some of the questions at the location, and others may require a little research.

To log this cache you will need to answer the following questions:
  1. What type of rock is the feature made from?
  2. What is the name of sculptor who created the artwork?
  3. The rock from which the sculpture is made is more than 2.5 billion years old, so what geological period is it from?
  4. Name three other countries in the world where this type of rock can be found.
For permission to log this EarthCache, send answers to the questions to the cache owner, but please don’t include any answers in your log! Feel free to include photographs of the location, but these are not required.
 
More information
The cache is at its best during working hours, Monday to Friday, as that's when the moving features of the sculpture are turned on.
 
Granites and granitoids are examples of common intrusive igneous (‘plutonic’) rocks, and are classified as ‘felsic’, having feldspars and quartz (silica) as their most abundant minerals. These minerals give granites their characteristic light colours, often with flecks of darker mineral grains. The mineral grains are usually relatively large, which is due to the very slow cooling of magma (molten rock) at considerable depth (up to tens of kilometers) in the Earth’s crust. Although granites are among the most common intrusive igneous rocks, some varieties are rare and known from only a few localities worldwide – including the rock from which the artwork is made!
 
While some granites can be as much as 3.4-3.6 billion years old, over long time frames the immense pressures and high temperatures deep in the Earth’s crust usually change igneous rocks like granite into metamorphic rocks such as gneiss. At the other end of the scale, the world’s ‘youngest’ known granites in Japan are still about 1.2 million years old!

Look at http://www.treasures.uwa.edu.au/treasures/#2-1 for more information!

Congratulations to SpatialRiq for FTF!! And Sfibol for 2TF!

Additional Hints (No hints available.)



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