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Listen to an Academic Talk Test #002
Listen to an Academic Talk
1. What is the professor's main purpose?
A) To compare different types of hot springs
B) To describe the conditions necessary for geysers to form
C) To discuss the tourist impact on Yellowstone Park
D) To explain the chemical composition of geyser water
2. According to the professor, what prevents the superheated water from boiling initially?
A) The lack of oxygen underground
B) The depth of the water source
C) The pressure from the water above it
D) The specific mineral content of the rocks
3. What can be inferred about areas with many geysers?
A) They were once covered by oceans.
B) They are likely to experience frequent earthquakes.
C) They have significant geothermal activity near the surface.
D) They are the best locations for sourcing drinking water.
4. Why does the professor mention Yellowstone National Park?
A) To give an example of a well-known geyser location
B) To describe the world's largest geyser
C) To discuss the history of geology
D) To explain how magma moves
Professor: Today we're looking at a spectacular geological feature: geysers. A geyser is a rare type of hot spring that periodically erupts, sending a column of hot water and steam into the air. But how does this happen?
For a geyser to form, three specific conditions must be met. First, you need an abundant underground water source. Second, an intense heat source, which is usually magma located relatively close to the Earth's surface. And third, a unique underground plumbing system made of fissures and cracks that can withstand high pressure.
Water fills this system and is superheated by the magma, but the pressure from the water above prevents it from boiling. Eventually, the pressure builds until it forces some water out at the top, which lowers the pressure on the water below. This causes a chain reaction, and the superheated water flashes into steam and erupts. Yellowstone National Park in the US contains about half of the world's active geysers.
For a geyser to form, three specific conditions must be met. First, you need an abundant underground water source. Second, an intense heat source, which is usually magma located relatively close to the Earth's surface. And third, a unique underground plumbing system made of fissures and cracks that can withstand high pressure.
Water fills this system and is superheated by the magma, but the pressure from the water above prevents it from boiling. Eventually, the pressure builds until it forces some water out at the top, which lowers the pressure on the water below. This causes a chain reaction, and the superheated water flashes into steam and erupts. Yellowstone National Park in the US contains about half of the world's active geysers.
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