, Points Earned:, 0/1Correct Answer:, AYour Response:, C///, 14Points Missed, 0Percentage, 100% , 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 second-oldest sedimentary rock layer?
, A., BB., CC., ED., FE., DThe package of sediments C, D, E, and F is upside-down, as shown by the footprints and mud cracks, so C is the oldest one, and D is second-oldest., Points Earned:, 1/1Correct Answer:, EYour Response:, E2., Which is the oldest fault:, A., HI is cut by J, so I is older than J. And with reference to K, both I and J can be shown to be older than H. , Points Earned:, 1/1Correct Answer:, BYour Response:, B3., Which is older:, A., Unconformity K.B., Fault I.C., Fault H.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., Points Earned:, 1/1Correct Answer:, DYour Response:, D4., Which is younger:, A., Unconformity L.
5., Which is not accurate about the Grand Canyon, in Arizona:, A., The rock record of the canyon contains many unconformities.B., The youngest rock layer at the canyon slants downward to the north beneath still-younger rocks of Zion, Bryce, etc.C., The oldest rocks are on top, with younger ones beneath, as shown by all of the footprints being upside-down in the rocks of the canyon walls.D., A great thickness of sedimentary rocks exists in Death-Valley-type faulted basins, which can be seen deep in the canyon in many places.
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- Sedimentary rocks, Correct Answer, Points Earned