(a) Figure 5.7 includes a map and cross-section of a part of Grand Banks, Newfoundland, and the adjacent sea floor. On November 8, 1929, an earthquake occurred here, causing a huge submarine landslide and the subsequent breakage of several trans-Atlantic telegraph cables on the sea floor. Most geologists believe the landslide incorporated water as it moved downslope and became a turbidity current. Calculate the approximate speed of the current between points H and I, I and J, J and K, and K and L, in nautical miles per hour (i.e., knots). (1 nmi = 1.15 ml = 1.85 km.) Please read the figure legend before attempting to answer the question. You will need a ruler to accurately measure the distance along the scale at the bottom of the diagram.
Answer to relevant QuestionsThe four main types of sandstone are illustrated in Fig. 5.8. Which is which, and why?Why wouldn’t gabbro be a likely source rock for an arkose sandstone?Why is the study of sedimentary rocks of more than academic interest?What is dolomite or dolostone?Who is given credit for the principle of uniformitarianism (the present is the key to the past)?
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