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