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, Points Earned:, 1/1Your Response:, E///, 12Points Missed, Percentage, 86%, The next four (4) questions refer to the diagram above. This diagram shows a geologic cross-section of some rocks, such as you might see in a cliff. The tree is growing on top of the modern surface. Rock layers A,B, C, D, E, and F are sedimentary; E contains mud cracks and fossil footprints as shown. G is igneous rock that hardened from hot, melted rock. H, I and J are faults, and K and L are unconformities. Sedimentary rocks are right-side-up unless there is some indication given to show something else. Referring to the rocks you see here ......1., Which is the correct age progression, from older (first) to younger (last)?2
The package of sediments C, D, E, F is upside-down, as shown by the footprints and mud cracks, so C is oldest, and F the youngest of these. B is above the unconformity above all of C, D, E, and F, so is the youngest of these five., Points Earned:, 0/1Your Response:, C2., Which is the oldest fault:Points Earned:, 1/1Your Response:, B3., Which is older:, A., Unconformity K.B., Fault H.C., Fault I.D., Unconformity L.E., Fault J.Unconformity L is cut by fault I, so is older than I. Fault I is cut by fault J, so is older than J. Fault J is cut by unconformity K so is older than K. Unconformity K is cut by intrusion G so is older than G, and intrusion G is cut by fault H so is older than H. Hence, unconformity L is the oldest on this list., Correct Answer:, DPoints Earned:, 1/1Your Response:, D4., Which is younger:,
Points Earned:, 1/1Your Response:, E5., Which is accurate about the history of the Grand Canyon:,