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TOEFL Directory > TOEFL writing > Listening Unit two passage 34
Listening Unit two passage 34
Listen to the passage again and check out the script.
★Listen to part of the lecture in a Geology class
Most of you are probably familiar with the flow of lava that can result from volcanic eruption. Lava is actually being mixture of magma and convince to be produce underground. And many people think this eruption refer only to an explosion, but in geology an eruption is any release of magma. This can and often does common the form of the explosion. But sometimes the magma just blows out with the mouth of volcano. In any events, let's take a look at more some of the other hazards caused by volcanic events. Pyroclastics is the word used to describe the fragmentary rocks that were rejected during the volcanic eruption. The pyroclastics fall is combination of rock fragments and fluid fire lava that built in the air. This project tiles can be just tiny piece of ash or they can be rock fragments typically the size of baseball or volleyball. Although some be so enormous they weigh many tons, the most dangerous of all volcanic events is what we call pyroclastic flow, in this explosion, there are tremendous released pressure and these result in avalanche super heated mixture of gas and rock. This glowing avalanche as it caused can reach the temperature of 1000 degree centigrade and can travel as far as 600 kilometers in an hour. It can literally destroy everything as it passed. And that's what happen when Mount Pelée erupt on Martinique island in 1902. Within the minute after the volcano erupted, the town of Saint Pierre was completely wipe out.
Correct answers :CBDBA
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