If the 4.6 billion years of Earth history are 100 yards, then the few thousand years of written history are just one-millionth of that history, just over the thickness of a sheet of paper. , Points Earned: , 0/1 Correct Answer: , A Your Response: , C /// , 14 Points Missed , 0 Percentage , 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., D The 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: , 1/1 Correct Answer: , E Your Response: , E 2. , Which is the oldest fault: , A. , H B. , I C. , J I 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: , 1/1 Correct Answer: , B Your Response: , B 3., Which is older:, 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: , 1/1 Correct Answer: , D
Your Response: , D 4. , Which is younger: , A. , Unconformity L. B. , Fault J. C. , Rock layer A. D. , Rock layer B. E. , The tree. The tree is growing on intrusion G, which can be shown to be younger than all of the others. , Points Earned: , 1/1 Correct Answer: , E Your Response: , E
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