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Plate Boundaries Describe and explain destructive plate boundaries. - Leaving Cert Geography - Question 3C. - 2018
Question 3C.
Plate Boundaries Describe and explain destructive plate boundaries.
Worked Solution & Example Answer:Plate Boundaries Describe and explain destructive plate boundaries. - Leaving Cert Geography - Question 3C. - 2018
Step 1
Describe destructive plate boundaries.
Answer
Destructive plate boundaries, also known as convergent boundaries, occur where two tectonic plates collide, causing one plate to be forced beneath the other in a process called subduction. This interaction typically happens between an oceanic plate and a continental plate, or between two oceanic plates. As the denser oceanic plate subducts, it can lead to the formation of deep ocean trenches and volcanic arcs.
The intense pressure and friction generated at these boundaries can result in significant geological activity, including earthquakes and volcanic eruptions. The movement of these plates reshapes the Earth's surface, creating mountains and contributing to various geological features.
Step 2
Explain the processes involved in destructive plate boundaries.
Answer
The processes at destructive plate boundaries include:
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Subduction: One tectonic plate is pushed down into the mantle beneath another plate. This process leads to the melting of the descending plate, which can generate magma and subsequently lead to volcanic activity.
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Earthquake Activity: The collision of the plates creates immense stress that can be released as earthquakes. The depth and magnitude of these earthquakes can vary greatly, depending on the type and nature of the plates involved.
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Volcanism: As the subducted plate melts, magma rises to the surface, resulting in the formation of volcanoes. This is often seen along volcanic arcs located near the subduction zones.
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Formation of Geological Features: Destructive boundaries can also lead to the formation of deep ocean trenches, such as the Mariana Trench, and mountain ranges like the Andes, as the Earth’s crust is deformed and uplifted due to the tectonic activity.
Step 3
Provide a diagram representing destructive plate boundaries.
Answer
A labelled diagram showing the interaction between an oceanic and a continental plate at a destructive boundary is essential. It should illustrate the subducting oceanic plate descending beneath the continental plate, the formation of a trench, and associated volcanic activity. Here is an example of what this diagram could include:
- Oceanic Plate
- Continental Plate
- Subduction Zone
- Ocean Trench
- Volcanic Arc
Ensure that the diagram is accurately labelled to convey the processes discussed.