Please read instruction carefully and give lots of detail in explaination. Thank

Question

Please read instruction carefully and give lots of detail in explaination. Thank you so much in advance.

Shown below is a 'real' section through part of the crust. The top of the diagram is the surface, and you can assume that the units are very thick. Note the different vertical and horizontal scales. There are three lithologies, which you can assume to be uniform: granite bedrock, sedimentary bedrock and till. The upper part of the till is dry whereas below the water table the till is (obviously!) wet Dry Glacial Till 10 m Water table 30 m Wet Glacial Till Granite Consolidated Sedimentary Bedrock 250 500 m (a) Pick four different values for the resistivities of the four materials. They have to be different from each other by at least a factor of 10 and they also have to be reasonable. Briefly explain why you chose them. [It's a good idea to look at the graphs, you have 4 log cycles available.] (b) We carry out two Wenner CST's along the surface from left to right. The first one has an a- spacing of 10 m, and the second has an a-spacing of 20 m. Sketch the apparent resistivity vs horizontal distance along the traverse for the two different a-spacings: label the axes. You can put both lines on the same graph if you like, and you don't have to show the individual data points. Use your chosen 'real' resistivities and the ground structure explain the features of your lines, including especially artifacts associated with crossing vertical lithological boundaries and how the apparent resistivity depends on depth penetration of the arra

Explanation / Answer

ANSWER:

Electrical and Electromagnetic Methods

Electric circuit has three main properties:

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