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TOEFL COURSES --> Building iBT TOEFL --> Listening Section
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Script:

You might think that the diamond ring on your mom′s finger is just some expensive rock that your dad bought for her, but do you realize all the work that went into the creation of it?

First, can you believe that the diamond is 2 to 3 billion years old? Even stranger is that it started out as a lump of coal. Basically, this piece of coal was about 160 kilometers down inside the Earth. The pressure was incredible. Also, it’s about 2200 degrees Fahrenheit down there. That intense heat and pressure changed the carbon molecules in the coal and rearranged them into the crystallized diamond we’re so familiar with. Okay, that’s fine, but all this happens deep within the Earth. So how does it get to the surface? Well, the diamond was contained in molten rock, or magma, underneath the ground. The magma rose up to the Earth′s surface and erupted from a volcano. Then the magma hardened into rock.

 

Finally, the rock that contained the diamond weathered away, revealing the diamond underneath. It was then ready for miners or other treasure-hunters to find. 

1. What is this lecture mainly about?
A. How to classify different types of diamonds
B. A natural process that results in a transformation
C. The geological process that results in volcanoes
D. A comparison of how coal and diamonds are formed
Explain:
2. What aspect of diamonds does the professor discuss?
A. How they are created
B. How they are cut
C. Where to find them
D. Why they are valuable
Explain:
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