GEOGRAPHY HOMEWORK ON STRUCTURES,EARTHQUAKES, AND TECTONICS -24 April 2018 Due D
ID: 3198254 • Letter: G
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GEOGRAPHY HOMEWORK ON STRUCTURES,EARTHQUAKES, AND TECTONICS -24 April 2018 Due Date Name 1. Apparent Polar Wandering: The relationship between the angle of inclination of the earth's magnetic field lines-of force (1) is proportional to the latitude (L) at which the measurement is made. This can be expressed mathematically as: Tangent (I) = 2 Tangent (L) In a given region, paleomagnetic evidence from a series of basaltic lava flows shows that, over the past 100 million years, the magnetic inclination at this spot has changed significantly, indicating a major shift in the tectonic plate location. 100 my ago, the angle of inclination was 5°, 50 million years ago it was 35°, 20 million years ago it was 45°, while the modern angle of inclination is 61°. When we insert the current (modern) angle of inclination into the equation for (I), and solve the equation for (L), we find the current latitude of our location, 42° For the following data, using a calculator, pencil paper and protractor, tangent tables (provided) or any other method you can, determine: 1. The what the latitude of our lava flow site was 100 my, 50 my, and 20 my ago. 2. The changes in climate and geographic position ITI ngle of Magnetic Inclination 0 420 45° 35° 5° 20 50 100 Example: Tan B - Length opposite/length adjacent. Tan B 6.00/400 -1.500. B 5630 Mypot enuse 7.21 can 4.00 Adjacent Side 6.00 c Opposite SideExplanation / Answer
L=Tan-1 (Tan(I)/2)
Age :0 L=Tan-1 (Tan(61)/2)=Tan-1 (0.90202387763)=42.05
Age :20 L=Tan-1 (Tan(45)/2)=Tan-1 (0.5)=26.565
Age :50 L=Tan-1 (Tan(35)/2)=Tan-1 (0.3501037691)=19.295
Age :100 L=Tan-1 (Tan(5)/2)=Tan-1 (0.04374433176)=2.505
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