# Glg101 R4 Week 3 Plate Tectonics Worksheet

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Glg101 R4 Week 3 Plate Tectonics Worksheet
Associate Level Material

Plate Tectonics Worksheet
Answer the lab questions for this week and summarize the lab experience using this form.
Carefully read Ch. 8 of Geoscience Laboratory.
Complete this week’s lab by filling in your responses to the questions from Geoscience Laboratory. Although you are only required to respond to the questions in this worksheet, you are encouraged to answer others from the text on your own.
Questions and charts are from Geoscience Laboratory, 5th ed. (p. 133-150), by T. Freeman, 2009, New York, NY: John Wiley & Sons. Reprinted with permission.

Lab Questions:
8.4 Which has the greater proportion of Iron, Magnetite, or Hematite?
Hematite has the greater proportion of iron.
8.7 When the reverse switch of a drill is thrown the drill rotates in the opposite direction. How does that affect the drill’s circuitry?
When the reverse switch of a drill is thrown, the circuitry of the drill changes its magnetic field. Where it was positive before, it will now be a negative. Likewise, when the drill is switched back to positive, it will go from positive to negative.

8.9 Name the 2 other spheres.
The two other spheres are hydrosphere and atmosphere.

8.11 As Columbus’s fleet sailed westward the discrepancy between magnetic north and celestial north changed. Did it increase of decrease?
The discrepancy between magnetic north and celestial north increased enough that Columbus’s men wanted to turn back and not complete the journey.

8.12 Explain the difference in the orientations of the inclined compass needles in figure 8.18.Toward which cardinal direction is the observer facing?
Much like a toile flushing counter clockwise in the southern hemisphere, compass needles face the opposite direction. In the southern hemisphere, the needles of the compass would face north, while in the northern hemisphere, the needles would face south. Looking at the compass, it would appear the person is facing towards the west.

8.16 During which of these 5

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