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.” (10[1])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[3])Applied stresses can cause excess (-5[1])pore water pressure to build (-5[1])in this material, (10[1]-5[1])causing (10[1])its “liquefaction” during earthquakes. (10[2])Based on its particle (-5[1])size distribution, (-5[1])this material can be classified into subtypes such as sand and clay. (10[1])For 10 points, what organic material (10[1])do plant roots typically anchor themselves in? ■END■ (10[7])