Of the following numbered units, which is the youngest? A cross section of a rocky, mountain landscape has different locations and features numbered.The landscape shows a river running through a canyon between two mountains. A cross section shows six layers below. A diagonal fault climbs through the layers. The following locations and features are numbered. 1, the canyon wall just above the river. 2, a layer in the middle of a cliff face and the fourth layer from the bottom in the cross section below. 3, the base of a mountain. 4, A granite intrusion rising through the bottom layers. 5, The top layer. 6, The bottom layer. 7, The river. 8, the second layer from the bottom. 9, cooled lava that rose up from the bottom layer to the top of a volcano, flowed down the side, and pooled on the flat ground below. 10, the third layer from the bottom. 11, the fourth layer from the bottom. 12, The uniform border between the top two layers. 13, the unconforming border between the bottom two layers. @McGraw-Hill Education Multiple Choice unit 5 unit 6 unit 9 unit 11 unit 4