ERTH 2415 Lecture Notes - Lecture 15: Planetary Differentiation, South Nation River, Inner Core

• School: Carleton University
• Department: Earth Sciences
• Course: ERTH 2415
• Professor: Jason Mah

Document Summary

Conditions decreasing stability: adding mass high on a slope, steeping of slope, removing support at the base of the slope (refer to lectures for these) Conditions decreasing stability: presence of weak material, material that deforms plastically under stress and loses strength, crumbly, poor-consolidated material, lubricants, e. x clay. Conditions decreasing stability: fracture in rock, fractures orientated in the slope direction are particularly unstable, fractures in rock exist at different scales, regional scale, local scale, hand sample scale, microscopic scale. Internal roles of water: adding weight to porous earth materials, dissolving cement binding minerals together, erosion in the subsurface, can create a network of caves, high pore pressure, congelifraction. Liquefaction: low pore pressure; strong binding force, high pore pressure; weak binding force, grains are literally floating in water. Inner core: solid iron ]- very dense: outer core: liquid iron , mantle: iron and magnesium ]- dense, crust: silicon and oxygen ]- less dense.