Week 9 Blog: Earthquakes and Volcanoes

 What did you do in lab this week? (photos below)

What was the big question? What are the different types of volcanoes? Where do volcanoes and earthquakes occur? 




 

What did you learn in discussion this week? 

Oldest to Youngest:

  • White Sandstone 

  • Siltstone 

  • Shale

  • Igneous Batholith 

  • Igneous Dike A 

  • Sandstone A 

  • Conglomerate 

  • Igneous Dike B 

  • Dolostone 

  • Sandstone B 

  • Glacial Debris  

Location of Earthquakes and Volcanoes: 

  • Fault lines: tectonic plates are broken at fault lines 

  • Coast lines are typically on the edge of fault lines 

  • Not all earthquakes and volcanoes are found on fault lines 

  • Example of this: Hawaii 

Wegener and Tectonic Plates:

  • Alfred Wegener was a German climatologist and geologist 

  • He proposed a theory called Continental Drift in 1912 

  • He used fossil evidence and layers of rock to support his theory 

  • His theory was eventually accepted in 1967 and was changed to the Theory of Plate Tectonics 

Hawaii Continued: 

  • Ocean waves eat away at Hawaii Islands 

  • There is a new Hawaiian island that will not surface for 10,000 years 

  • The hot spot (Mantle Plume) doesn’t move but the plate drifts over it, creating new islands

Online Chapter: 

1. What did you learn? I learned about the two different types of volcanic eruptions: explosive eruptions, and effusive eruptions. An explosive eruption is the one I most commonly think of when I think of volcanoes. I also learned more about how volcanoes formed: convergent plates, divergent plates, and hot spots. I also learned more about what causes earthquakes to happen. 

2. What was most helpful? The visual of the S and P waves in the core of the earth and how this relates to how Earthquakes happen. 

3. What do you still need more information on? Why are there only volcanoes in certain places of the world?

4. What questions/comments/concerns do you have? Could a volcano forming cause an earthquake?

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