On the map on page 9 highlight the mid ocean ridge in

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Basic Blueprint Reading and Sketching
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Chapter 4 / Exercise 12
Basic Blueprint Reading and Sketching
Olivo
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1.On the map on page 9, highlight the mid-ocean ridge in the Elrond Sea and label it theHobbit Ridge. 2.Draw a diagram and explainthe origin of the striped magnetic anomaly patternvisible in the Elrond Sea.3.The pattern of positive and negative magnetic anomalies in the Elrond Sea can becorrelated with the pattern of normal and reversed magnetism on the magneticpolarity time scale. Based on this correlation, how many million years (m.y.) ago didsea floor spreading begin in the Elrond Sea?
4.Using the magnetic anomaly pattern in the Elrond sea, determine the 1/2-spreadingrate on the Hobbit Ridge (i.e., determine how fast the Frodo continent is moving awayfrom the Hobbit ridge). Give your answer in mm/y (millimeters per year). Show yourequations and explain where each number came from.
5.What is the full spreading rate (in mm/y) of the Hobbit Ridge? (i.e., how fast are theBilbo and Frodo continents moving away from each other)? Show your equationsand explain where each number came from.
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Basic Blueprint Reading and Sketching
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Chapter 4 / Exercise 12
Basic Blueprint Reading and Sketching
Olivo
Expert Verified
“Geoworld” Plate Tectonics Lab36.Using the magnetic anomaly patterns in the Aragorn Ocean, determine when seafloor spreading started to form the Aragorn Ocean crust (remember, spreading is notactively going on now but it was at one time).
7.At the time that active sea-floor spreading was occuring in the Aragorn Ocean, atwhat rate was new sea-floor being created? (Think: is this related to the fullspreading rate or the half spreading rate)? Show your equations and explain whereeach number came from.Rate of formation of Aragorn Ocean crust =__ mm/yB. Plate Boundaries1.There are two plate boundaries on the map. You already highlighted one of them inPart 1, A. 1. above. Highlight the other boundary also.2.Give one example of each of the following types of plate boundaries on Geoworld(Note: the boundary between two plates can vary in type from place to place).
3.How many lithospheric plates are there in all?C. Cross-SectionMake a schematic cross-section of Geoworld along A-A'. Draw it in the boxprovided at the bottom of the map on page 9. Show the entire thickness of the lithosphereand part of the asthenosphere. Label the crust, mantle lithosphere and asthenosphere.

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