How can we model ductile rocks in the classroom?
Video lecture on how temperature controls mechanical behavior of materials, including rocks. A Big Hunk candy bar is used as a model for the behavior of materials in the lower lithosphere. The cold candy bar is brittle while the warm candy bar is ductile or plastic.
Dr. Robert Butler, University of Portland, OR shows that a material can be either ductile or brittle; temperature can control the mechanical behavior of a material; and a Big Hunk candy bar can be used as a model for the lithosphere
Video lecture about elastic rebound and brittle material in the crust using a yardstick as a mechanical analog. This demonstrates elasticity, brittle fracture, and why it is difficult to predict earthquakes.
The Earth has 3 main layers based on chemical composition: crust, mantle, and core. Other layers are defined by physical characteristics due to pressure and temperature changes. This animation tells how the layers were discovered, what the layers are, and a bit about how the crust differs from the tectonic (lithospheric) plates, a distinction confused by many.
A candy bar, made almost entirely from nougat, is a useful model for connecting strain in rocks to faulting (earthquakes) and folding.
In this activity students will evalaute Silly Putty and Oobleck, both of which demonstrate proprieties of both solid and liquids, as a potential concrete model for Earth's Asthenosphere.