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Mechanical Weathering

Mechanical weathering breaks down rocks and minerals without changing their chemical composition; for example, by ice wedging.

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Hoodoo You Love

Hoodoo You Love

Credit: Paul Fundenburg
Source: http://www.flickr.com/photos/47824692@N00/2596647947
License: CC BY-NC 3.0

Bryce Canyon National Park in Utah has the most hoodoos on Earth. It’s possible to see in this photo how rock type and erosion could lead to their formation.

Amazing But True!

  • Hoodoos are spires of soft rock capped with an erosion-resistant rock found in arid regions.
  • Hoodoos form in arid regions.
  • At Goreme National Park, volcanic activity covered the area in volcanic ash and lava.
  • Bryce Canyon National Park is composed of different types of sedimentary rocks.
  • In the Cappadocia region of Turkey, people live in houses carved into the hoodoos.

Show What You Know

Learn more with the links below. Then answer the following questions.

  1. What characteristics are needed in the two layers of rocks that form a hoodoo?
  2. Why is it necessary for the rocks to have these characteristics?
  3. What type of volcanic eruptions and in what order led to the hoodoos at Goreme National Park?
  4. Besides the right types of rocks in the right places, what else is needed for a hoodoo to form?
  5. Which weathering process which erosion process contributes most to forming the hoodoos?

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Image Attributions

  1. [1]^ Credit: Paul Fundenburg; Source: http://www.flickr.com/photos/47824692@N00/2596647947; License: CC BY-NC 3.0

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