Earth 24

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Deformation of the Crust

Crustal deformation refers to the changing earth’s surface caused by tectonic forces that are accumulated in the crust and then cause earthquakes. So understanding the details of deformation and its effects on faults is important for figuring out which faults are most likely to produce the next earthquake. The three main types of stress go along with the thred types of plate boundaries: compression is common at convergent boundaries, tension at divergent boundaries, and shear at transform boundaries.

Lesson 1 (or “Day 1”) Material
Lesson 2 (or “Day 2”) Material
Lesson 3 (or “Day 3”) Material
Lesson 4 (or “Day 4”) Material

1:32 Deformation of rocks

8:36 Deformation of Rocks

9:07 Folds, Dip and Strike


Compare Contrast and Debate

Background: In all of the sciences, there are words used with specific meanings which have differing meanings in “every-day-language.” For example, in Earth Science, we use the words “stress”, “strain”, and “fault.” The definitions of these words when used in a general sense differ from the meaning when used in the context of the deformation of Earth’s crust. While the definitions are similar – they are not the same.

  • Position A: Scientists should avoid using words that are easily confused with words used in every-day language. Instead, new words should be created that have the specific meaning intended by those words.
  • Position B: While every-day language and scientific words often over-lap, both scientists and lay-people should be able to identify when a particular meaning is intended by a specific word simply by the context of the conversation. For example, if “strain” is used when talking about Earth Science, then the meaning of “strain” is specific to that conversation.

Resources Documents and Links

Special Notes and Notices

Instructor Emphasis:

  • Science & Engineering Practice: Develop and use models.
  • Cross-Cutting Concept: Cause and Effect: Mechanisms and explanations.

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