<TED Worksheet (Free)>
55. What makes volcanoes erupt?
Steven Anderson
<5:10>   July 2020

 

Questions
(PDF)   (Word)

Answers
(PDF)   (Word)

Trascript

<Key Vocabulary>
Write the meaning(s) of each word. Write an example sentence (example sentences) if you need.

(1) emit

(2) fissure

(3) lava

(4) molten

(5) mantle

(6) strain

(7) crust

(8) equilibrium

(9) sulfur

(10) simultaneously

(11) plume

(12) stratosphere

(13) buoyant

(14) dissolve

(15) landslide

(16) quantity

(17) erosion

(18) corrode

(19) hydrothermal

(20) volcanologist

(21) conquer

(22) terrain

(23) volatile

(24) vent




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<Questions>

  1. In 1942, Dionisio Pulido, a Mexican farmer, thought that he heard thunder coming from his cornfield, but it was not thunder. What was it?
  1. a car accident
  2. a volcano eruption
  3. a plane crash
  4. a bomb explosion

 

  1. Magma usually remains under the Earth’s surface because of the three geological factors. What are they? Fill in the blanks.

Factor 1:  

lithostatic pressure

  • the weight of the Earth’s

      (1)                       pushing down

      on the (2)                            below.

 

Factor 2:  

(3)                           pressure

  • the force of magma that pushes back lithostatic pressure

 

Factor 3:  

the (4)                  strength of

the Earth’s (5)                        

  • the rock is usually strong

      enough and heavy enough to

      keep the (6)                      

      in place.




  1. What is one of the most common causes of an eruption?

    

 

4. The following sentences describe magmastatic pressure. Write “T” if the statement is true and “F” if the statement is false.

  1. Magma does not contain that many different elements or compounds.       
  2. The energy of high-pressure gas bubbles in magma can send plumes of ash into the stratosphere.            
  3. Many geologists believe that the Paricutin eruption in Mexico was not caused by the buoyant bubbles in the magma.                 
  4. Buoyant bubbles in magma can lower the density, and it can make the magma push through the crust.       
  5. There are three known causes for buoyant bubbles in magma.                
  6. Buoyant bubbles will also be created when magma begins to cool down.           

 

  1. Sometimes eruptions happen due to a drop in the lithostatic pressure caused by landslides, erosion, and melting glaciers. What is this process called?

   

 

  1. What is hydrothermal alteration?

   

 

  1. What makes it difficult to measure changes in magmastatic pressure?

   

 

  1. Volcanologists are constantly exploring new technology. Draw lines to match the new technology with what they are used for.





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<Answers>

  1. In 1942, Dionisio Pulido, a Mexican farmer, thought that he heard thunder coming from his cornfield, but it was not thunder. What was it?
  1. a car accident
  2. a volcano eruption
  3. a plane crash
  4. a bomb explosion

 

  1. Magma usually remains under the Earth’s surface because of the three geological factors. What are they? Fill in the blanks.

Factor 1:  

lithostatic pressure

  • the weight of the Earth’s

      (1)    crust     pushing down

      on the (2)  magma      below.

 

Factor 2:  

(3)    magmastatic    pressure

  • the force of magma that pushes back lithostatic pressure

 

Factor 3:  

the (4)  rock   strength of

the Earth’s (5)   crust    

  • the rock is usually strong

      enough and heavy enough to

      keep the (6)  magma    

      in place.




  1. What is one of the most common causes of an eruption?

    an increase in magmastatic pressure

 

  1. The following sentences describe magmastatic pressure. Write “T” if the statement is true and “F” if the statement is false.
  1. Magma does not contain that many different elements or compounds.      F    
  2. The energy of high-pressure gas bubbles in magma can send plumes of ash into the stratosphere.   T  
  3. Many geologists believe that the Paricutin eruption in Mexico was not caused by the buoyant bubbles in the magma.        F  
  4. Buoyant bubbles in magma can lower the density, and it can make the magma push through the crust.    T   
  5. There are three known causes for buoyant bubbles in magma.          F  
  6. Buoyant bubbles will also be created when magma begins to cool down.     T  

 

  1. Sometimes eruptions happen due to a drop in the lithostatic pressure caused by landslides, erosion, and melting glaciers. What is this process called?

   unloading

 

  1. What is hydrothermal alteration?

 It is a process of gradually turning hard stone into soft clay. 

 

  1. What makes it difficult to measure changes in magmastatic pressure?

 the depth and heat of magma chambers
  
 8. Volcanologists are constantly exploring new technology. Draw lines to match the new technology with what they are used for.

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