Lab 4 3 seafloor spreading

Florida State College at Jacksonville
ESC1000L: Earth and Space Science Lab
Module 4 Applications Assignment and Learning Summary
Name:

Directions: Complete the following activities from your text. Be sure to label and number each activity (you do not have to re-write the questions).

Activity 3.2 Examining Plate Boundaries (pg. 50): complete questions 1,1a, 1b, 1c, 2, 2a, 3, 3a, 3b

1. Divergent plate boundary

1a. Plates are moving apart

1b. Mid-ocean ridge

1c. Destruction

2. Transform plate boundary

2a. Destroyed, plates rub causing stress

3. Convergent plate boundary

3a. The plates are moving together

3b. A: Oceanic-Continental B: Oceanic-Oceanic C: Continental-Continental

Activity 3.5 Earthquakes: Evidence for Plate Tectonics (pg. 54): complete questions 1 and 2

1. Approximately 600 meters

2.They seem to be linear

Activity 3.6 Evidence: Paleomagnetism (pg. 55): complete questions 1 through 5

1. 5 intervals of reverse polarity

2. About 333,333 years ago

3. Reverse

4. 2 million years ago

5. Less than 1 million years

Activity 3.7A Paleomagnetism and Seafloor Spreading (pg. 56-57): complete questions 3 and 4

2. SAB: Roughly 40 km

NAB: Roughly 25 km PB: Roughly 80km

4. SAB: 80km NAB: 50km PB: 160km

Activity 3.7B Calculating the rate of Seafloor Spreading (pg. 57): complete questions 1 and 2

1. 25km x 100,000 cm/km = 2,500,000 /2,000,000 = 1.25 cm/yr

2. 80km x 100,000 cm/km = 8,000,000 /2,000,000 = 4 cm/yr

Module 4 Learning Summary

Compose a short (1-3 paragraph) summary of what you learned in this module. You may want to write about:

· your reaction to particular ideas presented in this module

· questions you may still have

· any “aha” moments that may have occurred to you

· connections between what you’ve learned and how you might use this information in your professional or personal life

Be as specific as possible about your learning and include one or two examples of how this module changed the way in which you think about the earth.