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Listen to an Academic Talk Test #088
Listen to an Academic Talk
1. What is the talk mainly about?
A) The formation of different types of rock
B) A process that occurs when tectonic plates meet
C) The composition of oceanic and continental plates
D) How mountains can affect weather patterns
2. According to the professor, what is a direct result of subduction?
A) The formation of deep ocean trenches
B) The cooling of the Earth's mantle
C) The slowing of continental movement
D) The creation of new oceanic plates
3. What can be inferred about a region located near a subduction zone?
A) It has very little geological activity.
B) It is likely to experience earthquakes and volcanic eruptions.
C) It is a relatively new part of the Earth''s crust.
D) It is located far away from any ocean.
4. Why does the professor mention the Andes Mountains?
A) To give an example of a feature created by subduction
B) To show that subduction only happens in South America
C) To describe the oldest mountain range in the world
D) To contrast two different types of plate boundaries
Professor: So, we know the Earth's crust is made of tectonic plates that are constantly moving. But what happens when they collide? One of the most important processes is subduction. This occurs at what we call a convergent boundary, where one plate dives, or subducts, beneath another.
Typically, this happens when a dense oceanic plate collides with a less-dense continental plate. The heavier oceanic plate sinks into the mantle beneath the continent.
This process isn't gentle. As the plate descends, it can create some of the planet's most dramatic features. For example, the deepest parts of the ocean, known as oceanic trenches, are formed at subduction zones.
Furthermore, the subducting plate melts, and that molten rock can rise to the surface, creating chains of powerful volcanoes on the continent above. The Andes Mountains are a prime example of this. Subduction is a key driver of geological activity on our planet.
Typically, this happens when a dense oceanic plate collides with a less-dense continental plate. The heavier oceanic plate sinks into the mantle beneath the continent.
This process isn't gentle. As the plate descends, it can create some of the planet's most dramatic features. For example, the deepest parts of the ocean, known as oceanic trenches, are formed at subduction zones.
Furthermore, the subducting plate melts, and that molten rock can rise to the surface, creating chains of powerful volcanoes on the continent above. The Andes Mountains are a prime example of this. Subduction is a key driver of geological activity on our planet.
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