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Listen to an Academic Talk Test #054
Listen to an Academic Talk
1. What is the main subject of the lecture?
A) The causes of volcanic eruptions
B) The composition of the Earth's layers
C) A theory that explains geological activity
D) The formation of the Himalayan mountains
2. According to the professor, where does most geological activity occur?
A) In the center of large plates
B) At the boundaries between plates
C) In the layer known as the asthenosphere
D) Near the Earth''s core
3. What does the theory of plate tectonics suggest about continents?
A) They have always been in their current locations.
B) They are moving very slowly over time.
C) They are not affected by volcanic activity.
D) They will eventually stop moving entirely.
4. What is the purpose of mentioning the Himalayas?
A) To provide an example of a plate boundary
B) To give an instance of a feature created by plate collision
C) To contrast two different types of mountains
D) To show where earthquakes are most common
Professor: Good morning. Let's begin our discussion of the fundamental theory of modern geology: plate tectonics.
The theory states that the Earth's outer shell, the lithosphere, is divided into a number of large, rigid plates that are in constant, slow motion. They float on a hotter, more fluid layer beneath them called the asthenosphere.
Now, most of the world's major geological activity, such as earthquakes and volcanic eruptions, occurs along the boundaries where these plates interact. For instance, when two plates collide, they can push up the land to form massive mountain ranges.
The formation of the Himalayas is a perfect example of this process; it happened when the Indian Plate crashed into the Eurasian Plate.
So, this single, elegant theory provides a comprehensive explanation for many of the Earth's large-scale geological features and processes. It truly unified the field of geology.
The theory states that the Earth's outer shell, the lithosphere, is divided into a number of large, rigid plates that are in constant, slow motion. They float on a hotter, more fluid layer beneath them called the asthenosphere.
Now, most of the world's major geological activity, such as earthquakes and volcanic eruptions, occurs along the boundaries where these plates interact. For instance, when two plates collide, they can push up the land to form massive mountain ranges.
The formation of the Himalayas is a perfect example of this process; it happened when the Indian Plate crashed into the Eurasian Plate.
So, this single, elegant theory provides a comprehensive explanation for many of the Earth's large-scale geological features and processes. It truly unified the field of geology.
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