<TED Worksheet (Free)>
75. How tsunamis work
Alex Gendler
 
<3:21> April 2014

 

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) besiege
(2) invasion
(3) retreat
(4) tidal wave
(5) trough
(6) crest
(7) eruption
(8) submarine
(9) landslide
(10) tectonic
(11) ripple
(12) wave shoaling
(13) harbor
(14) debris

 





<Questions>

  1. In 479 BC, Persian soldiers besieged the Greek city of Potidaea, but the invasion failed. Which of the following statements is not true about the attack?
  1. A huge tsunami hit the Persian attackers while they were crossing the area.
  2. The tide retreated much farther than usual, and the Persian soldiers thought it provided a convenient invasion route.
  3. The Potidaeans scientists knew a huge tsunami would attack the Persian soldiers.
  4. Historically, tsunamis have destroyed many cities and killed many people.

 

  1. Which of the following statements is not true about tsunamis?
  1. They are caused by the tidal activity caused by the gravitational forces of the Sun and Moon.
  2. They have a trough and a crest.
  3. They consist of the movement of energy through water.
  4. They are similar to regular waves in many different ways.

 

  1. One of the differences between regular waves and tsunamis is where their energies come from. Write down here their energies come from.
  • Regular waves:                         
  • Tsunamis:                                       

 




 

  1. The following section describes some characteristics of tsunamis. Fill in the blanks.
  1. Tsunamis move at over (1)                         miles per hour.
  2. Tsunamis are difficult to detect when they are (2)                         from shore because they move through the entire depth of the water.
  3. When they reach shallow water, something called (3)                                      (2 words)  occurs.
    → Because there is less water to move through, this massive amount of energy is (4)                         , and their height rises to as much as (5)                         feet.
  4. The word tsunami means “(6)                                    (2 words)” in Japanese, and this comes from the fact that they only seem to appear near the coast.
  5. If the trough of a tsunami reaches shore first, the water will withdraw (7)                         than normal before the wave hits, which can be misleadingly dangerous.
    → Tsunamis will drown people near the coast as well as level (8)                         and (9)                         for a mile inland or more, especially in low-lying areas.
    → When the water retreats, it drags newly created (10)                         , and anything, or anyone, in its path.
    (e.g.) The 2004 Indian Ocean Tsunami killed over (11)                         people.
  6. To protect ourselves, we have created sea walls, flood (12)                         , and channels to divert water, but these are not always effective.
    (i.e.) In 2011, a tsunami surpassed the flood wall protecting Japan’s (13)                           Power Plant, causing a (14)                         disaster.
  7. Many scientists and policy makers are instead focusing on
  1. early (15)                         
    > monitoring underwater (16)                         and (17)                         activity.
  1. establishing (18)                         communication networks
    > allowing people to distribute alerts quickly

*When nature is too powerful to stop, you should get out of its way.

 





<Answers>

  1. In 479 BC, Persian soldiers besieged the Greek city of Potidaea, but the invasion failed. Which of the following statements is not true about the attack?
  1. A huge tsunami hit the Persian attackers while they were crossing the area.
  2. The tide retreated much farther than usual, and the Persian soldiers thought it provided a convenient invasion route.
  3. The Potidaeans scientists knew a huge tsunami would attack the Persian soldiers.
  4. Historically, tsunamis have destroyed many cities and killed many people.

 

  1. Which of the following statements is not true about tsunamis?
  1. They are caused by the tidal activity caused by the gravitational forces of the Sun and Moon.
  2. They have a trough and a crest.
  3. They consist of the movement of energy through water.
  4. They are similar to regular waves in many different ways.

 

  1. One of the differences between regular waves and tsunamis is where their energies come from. Write down here their energies come from.
  • Regular waves:    wind   
  • Tsunamis:    energy originating underwater (a volcanic eruption, a submarine landslide, earthquake)   
  •  





 

  1. The following section describes some characteristics of tsunamis. Fill in the blanks.
  1. Tsunamis move at over (1)    500    miles per hour.
  2. Tsunamis are difficult to detect when they are (2)    far    from shore because they move through the entire depth of the water.
  3. When they reach shallow water, something called (3)wave shoaling   (2 words)  occurs.
    → Because there is less water to move through, this massive amount of energy is (4)    compressed    , and their height rises to as much as (5)    100    feet.
  4. The word tsunami means “(6)    harbor wave   (2 words)” in Japanese, and this comes from the fact that they only seem to appear near the coast.
  5. If the trough of a tsunami reaches shore first, the water will withdraw (7)    farther    than normal before the wave hits, which can be misleadingly dangerous.
    → Tsunamis will drown people near the coast as well as level (8)    buildings    and (9)    trees    for a mile inland or more, especially in low-lying areas.
    → When the water retreats, it drags newly created (10)    debris    , and anything, or anyone, in its path.
    (e.g.) The 2004 Indian Ocean Tsunami killed over (11)    200,000    people.
  6. To protect ourselves, we have created sea walls, flood (12)    gates    , and channels to divert water, but these are not always effective.
    (i.e.) In 2011, a tsunami surpassed the flood wall protecting Japan’s (13)    Fukushima    Power Plant, causing a (14)    nuclear    disaster.
  7. Many scientists and policy makers are instead focusing on
  1. early (15)    detection   
    > monitoring underwater (16)    pressure    and (17)    seismic    activity.
  1. establishing (18)    global    communication networks
    > allowing people to distribute alerts quickly

*When nature is too powerful to stop, you should get out of its way.

 

 

========================

Click here for more TED Talks Worksheets!

========================