One model of this material that features a “critical state line” is called its “Modified Cam” model. An equation developed by Karl von Terzaghi computes this material’s “bearing capacity.” This material’s swelling potential increases with its plasticity index, which can be calculated from its Atterberg limits. Increases in pressure cause this prototypical three-phase material to contract during “consolidation.” Compaction of this material can cause a structure’s foundation to move during “settlement.” (-5[1])Applied stresses can cause excess pore water pressure to build in this material, causing its “liquefaction” during (10[2])earthquakes. Based (10[1])on its particle size distribution, this material can be classified into subtypes (10[1])such as sand and clay. For 10 points, what organic material do plant roots typically anchor themselves in? ■END■ (10[1])