Essay on Associate Level MaterialPlate Tectonics WorksheetAnswer The

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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?
8.7 When the reverse switch of a drill is thrown the drill rotates
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Once the volcanoes form them they begin moving away downward.
8.20 Does it appear in figure 8.29 that the reversals in Earth’s magnetic field are separated in equal periods of time, or are they random in their occurrences?
They are random in their occurrences because for example, some periods they reversed 3 times, while in other periods they did not reverse at all.
8.21 What were the three observations that Vine and Mathews made about the stripes?
1. Directional trends- stripes tend to change all on the same direction.

2. Order of the color coding on sides of the ridges- the order of the colors on the side of the ridges corresponds to the color on the sea floor.

3. Widths of stripes compared to the duration of stripes-the wider the stripes are the longer the stripes lived.
8.25 Why doesn’t the South American plate descend beneath the Nazca plate?
The Nazca plate is denser than the South American plate.
8.26 How many years will it be until Los Angeles and San Francisco are side by side?
Approximately in 12.5 million years
8.27 What is the average rate of northward movement of India during the past 71 million years (in centimeters per year)?
15/71= approximately 2.12 cm per year
8.28 In centimeters per year, calculate the rate at which the Pacific plate is moving northwestern to the hotspot (which is marked by present day volcanoes).
50/5= 10 centimeters per year
8.30 Describe the direction of movement of the Pacific plate during…