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LAB MODULE 13: PLATE TECTONICS   Note: Please refer to the GETTING STARTEDmodule to learn how to maneuver through, and how to…

LAB MODULE 13: PLATE TECTONICS   Note: Please refer to the GETTING STARTEDmodule to learn how to maneuver through, and how to…

LAB MODULE 13: PLATE TECTONICS

 

Note: Please refer to the GETTING STARTEDmodule to learn how to maneuver through, and how to answer the lab questions, in the Google Earth () component.

 

KEY TERMS

 

You should know and understand the following terms:

 

 

 

Continental Drift

Pacific Ring of Fire

Reverse Fault

Earthquakes

Pangaea

Subduction

Hotspots

Plate Convergence

Transform Fault

Normal Fault

Plate Divergence

 

Overthrust fault

Plate tectonics

 

 

 

 

LAB MODULE LEARNING OBJECTIVES

 

After successfully completing this module, you should be able to do the following tasks:

 

·       Explain the theory of plate tectonics

 

·       Explain the theory of continental drift

 

·       Identify and describe types of plate movement

 

·       Identify and describe the three types of volcanoes

 

·       Explain the concept of hotspots

 

·       Compute the rates of plate movement

 

·       Identify and describe the different types of faults


INTRODUCTION

 

This module examines plate tectonics. Topics include continental drift, tectonic landforms, plate boundaries, faults and hotspots. While these topics may appear to be disparate, you will learn how they are inherently related. The module starts with four opening topics, or vignettes, which are found in the accompanying Google Earth file. These vignettes introduce basic concepts of the internal structure of the Earth. Some of the vignettes have animations, videos, or short articles that will provide another perspective or visual explanation for the topic at hand. After reading the vignette and associated links, answer the following questions. Please note that some links might take a while to download based on your Internet speed.

 

 

 

 Expandthe INTRODUCTION folder and then check Topic 1: Introduction.

 

 Read Topic 1: Introduction

 

Question 1: Based on this map, what is one continent in which the there are two (or more) plates?

 

A.   North America

 

B.   Europe

 

C.   Asia

 

D.   Africa

 

 Read Topic 2: Continental Drift

 

Question 2:What was discovered in Antarctica that solidified Wegener’s theory of continental drift?

 

A.   Snow and ice

 

B.   Mineral deposits

 

C.   Tropical plant fossils

 

D.   Extinct volcanoes

 

 Read Topic 3: Tectonic Landforms

 

Question 3:Where do scientists think the next major ocean will be formed?

 

A.   Gulf of Mexico

 

B.   Iceland

 

C.   Australia

 

D.   East Africa

 

 Read Topic 4: Human Interaction

 

Question 4: Based on the article, which is not a reason why humans are drawn to plate boundaries.

 

A.   Nice scenery

 

B.   Geothermal energy

 

C.   Fertile soil

 

D.   Ore deposits

 

 Collapse and uncheck the Introduction folder.
GLOBAL PERSPECTIVE

 

 Expand GLOBAL PERSPECTIVE. Double-click and select Tectonic Plate Boundaries and Names to display the names on the globe of the major tectonic plates.

 

Millions of humans live near the major tectonic plate boundaries. The potential dangers of living on or near a plate boundary include earthquakes, volcanoes, and tsunamis. However, these natural hazards do little to discourage people from settling in these cities, especially if the region has economic, religious, political or social importance.

 

 Expand and select Major Cities. Double-click and select Question 5. When you arrive at your destination, find the information to fill in the blanks below. Choose the two closest tectonic plates. Repeat this for Questions 5 to 8.

 

Question 5: City: San Francisco

 

Two closest tectonic plates

 

Plate 1 name:

 

A.   Pacific/North America

 

B.   Pacific/Californian

 

C.   North American/California

 

D.   Pacific/Juan de Fuca

 

Question 6: City: Taipei, Taiwan

 

Two closest tectonic plates

 

A.   Philippine/Taiwan

 

B.   Taiwan/China

 

C.   Philippine/China

 

D.   Eurasian/Philippine

 

Question 7: City: Jerusalem, Israel

 

Two closest tectonic plates

 

A.   Arabian/Eurasian

 

B.   Mediterranean/Eurasian

 

C.   African/Arabian

 

D.   African/Eurasian

 

Question 8: City: Karachi, Pakistan

 

Two closest tectonic plates

 

A.   Indian/Eurasian

 

B.   Arabian/African

 

C.   Pakistani/Indian

 

D.   Burmese/Eurasian

 

 Collapse and uncheck the GLOBAL PERSPECTIVE folder.

 

 

 

 

 

PLATE BOUNDARIES AND MOVEMENTS

 

In general, tectonic plate boundaries are classified as converging, diverging, and transform, while tectonic plate types are classified as either oceanic or continental. The following descriptions of plate boundaries and movements will help you answer Questions 10 to 23.

 

Converging Boundaries

 

When an oceanic plate and a continental plate converge (Figure 1), the result is subduction, because the oceanic plate slides under the continental plate. Mountain ranges of volcanoes are created by magma from the melting oceanic plate rising to (and through) the continental crust. Deep oceanic trenches typically parallel the coast.

 

 Expand the PLATE BOUNDARIES folder and then click Subduction Animation to view an animation of this type of convergence boundary.

 

 

Figure 1. Oceanic-continental convergence (USGS).

 

Figure 2. Continental-continental convergence (USGS).

When two continental plates converge (Figure 2), compression and uplift occur at the boundary to form mountain ranges. Continental-continental convergence mountains are not comprised of volcanoes and thus contrast the orogeny of mountain ranges produced by oceanic-continental convergence.

When two oceanic plates converge (Figure 3), one subducts under the other and the result is a deep ocean trench. In some cases, under sea volcanoes format these boundaries. Over millions of years, these oceanic-oceanic convergence boundaries produce volcanoes that reach the surface and form a chain of islands shaped in an arc.

 

 

Figure 3. Oceanic-oceanic convergence (USGS).

       

 

 

 

Diverging Boundaries

 

As the name implies, diverging boundaries occur where plates are moving away from each other. If the plates are oceanic, the result can be an underwater mountain range which follows the plate boundaries. If the plates are continental, the initial result is the creation of a valley or rift. Given enough time, these valleys or rifts might be submerged, forming long, narrow seas.

 

Transform Boundaries

 

Transform boundaries occur when two plates move horizontally past each other. The boundary, or fault, between the two plates can be several miles wide. Friction between the two plate boundaries can build up tectonic stress, which can be released instantaneously into the Earth’s crust in the form of an earthquake.

 

 Expand the Boundaries folder, check the Plate Boundaries folder, and then double‑click Boundary A.

 

Based on the descriptions of plate boundaries and movement provided, identify Boundaries A through G:

 

Question 9: Boundary  _________

 

A.   Continental-continental convergent                 

 

B.   Continental-oceanic convergent

 

C.   Oceanic-Oceanic convergent                          

 

D.   Oceanic divergent

 

E.    Continental-continental divergent                            

 

F.    Transform

 

Question 10: Why did you choose this answer?

 

A.   Red Sea is shrinking because two continental plates are coming together.

 

B.   Red Sea plate is subducting under the Arabian Plate

 

C.   The Arabian and African plates are moving away from each other, creating the Red Sea

 

D.   The African plate is subducting under the Arabian Plate, closing off the Red Sea to the Indian Ocean

 

 Double‑click Boundary B.

 

Question 11: Boundary  _________

 

A.   Continental-continental convergent                 

 

B.   Continental-oceanic convergent

 

C.   Oceanic-Oceanic convergent                          

 

D.   Oceanic divergent

 

E.    Continental-continental divergent                            

 

F.    Transform

 

Question 12: Why did you choose this answer?

 

A.   Himalayas were formed by Indian plate riding over the Eurasian plate

 

B.   Himalayas were formed by the Eurasian plate riding over the Indian plate

 

C.   Himalayas were formed by the Indian and Eurasian plates colliding

 

D.   Himalayas were formed by the Indian and Eurasian plates moving apart

 

 Double‑click Boundary C.

 

Question 13: Boundary  _________

 

A.   Continental-continental convergent                 

 

B.   Continental-oceanic convergent

 

C.   Oceanic-Oceanic convergent                          

 

D.   Oceanic divergent

 

E.    Continental-continental divergent                            

 

F.    Transform

 

 

 

Question 14: Why did you choose this answer?

 

A.   Mid-Atlantic ridge was created by North American and African plates colliding

 

B.   Mid-Atlantic ridge was created by South American and African plates colliding

 

C.   Mid-Atlantic ridge was created by North American plate subducting under the Eurasian plate

 

D.   Mid-Atlantic ridge was created by North American and Eurasian plates moving apart and the South American and African plates moving apart.

 

 Double‑click Boundary D.

 

Question 15: Boundary  _________

 

A.   Continental-continental convergent                 

 

B.   Continental-oceanic convergent

 

C.   Oceanic-Oceanic convergent                          

 

D.   Oceanic divergent

 

E.    Continental-continental divergent                            

 

F.    Transform

 

Question 16: Why did you choose this answer?

 

A.   The Pacific and South American Plates are moving apart, forming a deep trench

 

B.   The Pacific and South American plates are colliding forming the Andes Mountains

 

C.   The Pacific plate is subducting under the South American plate, forming a deep trench

 

D.   The South American plate is subducting under the Pacific plate, forming a deep trench

 

 

 

 Double‑click Boundary E.

 

Question 17: Boundary  _________

 

A.   Continental-continental convergent                 

 

B.   Continental-oceanic convergent

 

C.   Oceanic-Oceanic convergent                          

 

D.   Oceanic divergent

 

E.    Continental-continental divergent                            

 

F.    Transform

 

Question 18: Why did you choose this answer?

 

A.   The Pacific and North American Plates are moving apart, forming a deep trench

 

B.   The Pacific and North American plates are colliding forming the Andes Mountains

 

C.   The Pacific plate is subducting under the North American plate, forming a deep trench

 

D.   The North American plate is subducting under the Pacific plate, forming a deep trench

 

 Double‑click Boundary F.

 

Question 19: Boundary  _________

 

A.   Continental-continental convergent                 

 

B.   Continental-oceanic convergent

 

C.   Oceanic-Oceanic convergent                          

 

D.   Oceanic divergent

 

E.    Continental-continental divergent                            

 

F.    Transform

 

Question 20: Why did you choose this answer?

 

A.   The two plates are colliding, creating a series of lakes in Eastern Africa

 

B.   The two plates are moving apart creating a series of lakes in Eastern Africa

 

C.   The two plates are sliding past each other creating a series of lakes in Eastern Africa

 

D.   The two plates are colliding and shrinking the lakes in Eastern Africa

 

 Double‑click Boundary G.

 

Question 21: Boundary  _________

 

A.   Continental-continental convergent                 

 

B.   Continental-oceanic convergent

 

C.   Oceanic-Oceanic convergent                          

 

D.   Oceanic divergent

 

E.    Continental-continental divergent                            

 

F.    Transform

 

 

 

Question 22: Why did you choose this answer?

 

A.   The Pacific and Philippine plates are moving apart, forming a deep trench

 

B.   The Pacific and Philippine plates are colliding forming the Andes Mountains

 

C.   The Pacific plate is subducting under the Philippine plate, forming a deep trench

 

D.   The Philippine plate is subducting under the Pacific plate, forming a deep trench

 

 Collapse and uncheck the PLATE BOUNDARIES folder.

 

 

 

 

 

EARTHQUAKES

 

When tectonic stresses from moving plates along boundaries and fault lines become too great, there can be a sudden release of energy which is manifested as an earthquake. The foci (where the earthquake originates) is often deep within the Earth’s lithosphere, while the epicenter, located vertically above the focus, is found at the Earth’s surface.

 

Earthquakes occur daily, yet we are not always able to feel them. Seismic waves (p and s waves) from the earthquake help triangulate the location of the epicenter by way of the Richter scale. The Richter scale, which is based on a logarithmic scale, measures the energy released by an earthquake; so, an earthquake measuring 4.0 on the Richter scale releases 10 times the energy as compared to one measuring 3.0.

 

It is estimated that there are on average 130,000 earthquakes worldwide measuring between 3.0 and 3.9 each year (USGS, 2011). The most powerful earthquake recorded was in Valdivia, Chile in 1960, measuring 9.5 on the Richter scale. It generated a tsunami that traveled over 10,000 km across the Pacific Ocean, striking Japan and the Philippines with waves as high as 35 feet.

 

 

Figure 4. Legend.

 Expand the EARTHQUAKES folder, expand the 2011 Earthquakes folder, and check only USGS Logo and Legend (Figure 4).

Within this folder are the locations, magnitudes (based on the Richter scale), and depths of all recorded earthquakes in 2011 (you might have to zoom in or zoom out to see the epicenters).

 

 Double‑click the Magnitude 9 folder.

 

Question 23: Where was the magnitude of 9 or higher recorded in 2011?

 

A.   Off the coast of California

 

B.   Off the coast of Chile

 

C.   Off the coast of Japan

 

D.   Off the coast of Hawaii

 

 Uncheck the Magnitude 9 folder. Double‑click and select the Magnitude 7 folder.

 

Question 24: How many earthquakes with a magnitude between 7 and 7.9 were recorded in 2011?

 

A.   19

 

B.   14

 

C.   26

 

D.  

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