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Chapter 18: Problem 20

The movement of one plate under another plate creates a a. divergent boundary. b. ridge. c. subduction zone. d. boundary zone.

Short Answer

Expert verified
The movement of one plate under another creates a subduction zone.

Step by step solution

01

Identify the type of plate motion

When one tectonic plate moves under another, it is an interaction known as subduction. This process is a crucial part of plate tectonics.
02

Understand the characteristics of subduction zones

A subduction zone is formed at convergent plate boundaries where an oceanic plate sinks beneath a continental plate or another oceanic plate. These zones are known for their high seismic activity, which can result in earthquakes and volcanic eruptions.
03

Match the definition with the options

Given the description of subduction, the correct answer aligns with a subduction zone, as it describes the movement of one plate being forced beneath another.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Subduction Zone
A subduction zone is a fascinating feature of the Earth's surface, where one tectonic plate slides beneath another. This process is central to understanding plate tectonics. Subduction occurs at specific areas called convergent plate boundaries. It happens when a denser oceanic plate is pushed below a lighter continental plate or another oceanic plate. As the sinking plate descends, it melts and creates magma, which can lead to volcanic activity.
  • Subduction causes significant geological activity, including earthquakes and volcanoes.
  • This process recycles oceanic crust back into the Earth's mantle.
  • The regions where subduction occurs are called trenches or deep-sea trenches.
Understanding subduction zones allows us to better predict natural phenomena such as tsunamis and volcanic eruptions.
Convergent Plate Boundary
Convergent plate boundaries are where two tectonic plates move toward one another. This movement leads to the formation of subduction zones when one of the colliding plates is forced beneath the other. These boundaries are crucial for understanding Earth's dynamic nature.
  • When continental plates converge, they can form mountain ranges like the Himalayas.
  • Oceanic-continental convergence often results in a subduction zone with volcanic arcs.
  • Convergent boundaries can be sites of high seismic activity.
The immense pressure and heat at these boundaries contribute significantly to the geological transformations on our planet.
Tectonic Plate Motion
The Earth's surface is composed of tectonic plates that are constantly in motion due to the heat-driven processes within the mantle. These movements are responsible for many geological phenomena. There are three basic types of plate boundaries: divergent, convergent, and transform.
  • At divergent boundaries, plates move away from each other, creating new crust.
  • At convergent boundaries, plates move towards each other, leading to subduction or mountain formation.
  • Transform boundaries involve plates sliding past one another, often causing earthquakes.
Tectonic plate motion shapes the Earth's landscape, and understanding these movements helps in predicting natural disasters and understanding the Earth's history.

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Most popular questions from this chapter

A vibration that moves through any part of Earth is called a a. seismic wave. b. gamma wave. c. Z-wave. d. radio wave.

The fastest seismic wave is the a. P-wave. b. S-wave. c. P-and S-waves are equally fast. d. surface wave.

A famous transform boundary in the United States is the a. Rocky Mountains fault. b. Mississippi fault. c. San Andreas fault. d. San Jose fault.

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The three main areas of Earth's interior are a. core, mantle, and crust. b. core, secondary layer, and surface. c. nucleus, mantle, and crust. d. core, mantle, and shell.
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