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Listen to an Academic Talk Test #059
Listen to an Academic Talk
1. What is the professor's main point?
A) How different types of rocks are formed
B) The process of geological dating
C) The differences between slate and schist
D) The history of a specific geographic region
2. What is required for metamorphism to take place?
A) The complete melting of a parent rock
B) The rapid cooling of volcanic magma
C) Exposure to high heat and pressure
D) The erosion of rock by wind and water
3. What can geologists learn by studying metamorphic rocks?
A) The age of the Earth's crust
B) The future location of volcanic activity
C) The past environmental conditions of an area
D) The exact depth where the rocks were formed
4. Why does the professor mention shale and slate?
A) To give an example of a rock transformation
B) To name two types of sedimentary rocks
C) To describe rocks that do not change
D) To show how rocks melt into magma
Professor: We've talked about igneous and sedimentary rocks, so today we'll focus on the third major type: metamorphic rocks. Metamorphic rocks are formed from pre-existing rocks, which we call the parent rock, that have been changed by intense heat and pressure.
This process, called metamorphism, occurs deep within the Earth's crust. It's important to understand that the parent rock doesn't melt into magma; instead, its mineral components are recrystallized and rearranged. For example, the fine-grained sedimentary rock shale, under moderate heat and pressure, becomes slate. If the pressure and heat increase, that slate can transform further into a rock called schist.
By studying the specific minerals in a metamorphic rock, geologists can deduce the temperatures and pressures the rock was subjected to, which gives us valuable clues about a region's geological history.
This process, called metamorphism, occurs deep within the Earth's crust. It's important to understand that the parent rock doesn't melt into magma; instead, its mineral components are recrystallized and rearranged. For example, the fine-grained sedimentary rock shale, under moderate heat and pressure, becomes slate. If the pressure and heat increase, that slate can transform further into a rock called schist.
By studying the specific minerals in a metamorphic rock, geologists can deduce the temperatures and pressures the rock was subjected to, which gives us valuable clues about a region's geological history.
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