Lesson 5 overview ================== This week we will be introduced to the equations that govern the flow of viscous materials. At depths greater than those where rocks deform in a brittle manner, crustal and mantle rocks can be treated as viscous fluids with very high viscosities. Ice also behaves as a viscous fluid in glaciers, which will be further explored in :doc:`this week's exercise `. Learning objectives ------------------- After completing this week's lesson you should be able to: - State what a fluid is and how its flow is related to its viscosity - Explain why geological fluids deform in a nonlinear fashion - Model the flow of ice in valley glaciers using viscous flow equations Lesson videos ------------- Lesson videos will be linked below after class. .. admonition:: Lesson 5.1 - Rocks and ice as viscous materials :class: admonition-youtube .. youtube:: Kx2F3TubCaM Dave Whipp, University of Helsinki @ `Quantitative Geology channel on Youtube `_. .. admonition:: Lesson 5.2 - Introduction to and Python tips for Exercise 5 :class: admonition-youtube .. youtube:: zXbVg0eG5MY Dave Whipp, University of Helsinki @ `Quantitative Geology channel on Youtube `_.