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4.11: Transform Plate Boundaries

Difficulty Level: Basic / At Grade Created by: CK-12
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What does a transform plate boundary look like?

In the dry part of central California, it looks like this. On one side is the Pacific Plate. On the other side is the North American Plate. Before plate tectonics theory, people thought the San Andreas was just a fault. Now it's known to be a plate boundary!

Transform Plate Boundaries

Two plates may slide past each other in opposite directions. This is called a transform plate boundary. The plates meet at a transform fault. As you might imagine, plates do not slide past each other easily. These plate boundaries experience massive earthquakes. The world’s best known transform fault is the San Andreas Fault in California (Figure below). At this fault, the Pacific and North American plates grind past each other. Transform plate boundaries are common as offsets along mid-ocean ridges. They are very small compared to transform faults on land.

Transform plate boundaries are different from the other two types of plate boundaries. At divergent plate boundaries, new oceanic crust is formed. At convergent boundaries, old oceanic crust is destroyed. But at transform plate boundaries, crust is not created or destroyed.

The red line is the San Andreas Fault. On the left is the Pacific Plate, which is moving northeast. On the right is the North American Plate, which is moving southwest. The movement of the plates is relative to each other.

Vocabulary

  • transform fault: An earthquake fault; one plate slides past another.
  • transform plate boundary: A plate boundary where two plates slide past one another.

Summary

  • At transform plate boundary two plates move in opposite direction.
  • Transform faults are the site of massive earthquakes.
  • The San Andreas Fault is the boundary between the Pacific and North American plates. It is the site of massive earthquakes.

Practice

Use this resource to answer the questions that follow.

http://www.learner.org/interactives/dynamicearth/slip3.html

  1. Describe the motion of transform boundaries.
  2. What is a fault?
  3. What do transform boundaries produce?
  4. Explain a strike-slip fault.
  5. What is the best studied fault?
  6. What two plates make this boundary?
  7. Which direction are each of these plates moving?

Review

  1. What is the direction of plate motion at a transform plate boundary?
  2. Why are transform faults prone to massive earthquakes?
  3. Why are earthquakes at the San Andreas Fault so enormous?

Image Attributions

Description

Difficulty Level:

Basic

Grades:

6 , 7 , 8

Date Created:

Jan 04, 2013

Last Modified:

Mar 12, 2014
Files can only be attached to the latest version of Modality

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\n Front Matter\n

\n

\n Foreword\n

\n

\n The study of Earth Science is the study of Planet Earth. Middle School Earth Science Concepts presents Earth Science as a set of concepts, with each concept centered around a specific category, such as the Earth's crust or plate tectonics. Each concept is comprised of a series of lessons, with each lesson focusing on one specific topic.\n

\n

\n Preface\n

\n

\n Dedication\n

\n

\n Chapters\n

\n

\n \"\"\n

\n
\n \n
\n

\n Back Matter\n

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Original text