- A
- B
- C
Listen to a lecture in a geology class, take detailed notes while listening.
crust – the outer layer of the Earth
displace – to move something out of its position
impact – the striking of one thing against another
massive – large
shove – to push
Fill in the following diagram.
Triggers
A 1.
B 2.
Effects
A 3.
B 4.
Now answer the questions using your notes.
Creation of Tsunamis
Which phrases describe causes or effects of a tsunami? Place a check mark in the correct box.
Summarize the text using your notes and diagram.
- 1: Earthquakes.
- 2: Meteor impact.
- 3: Waves rapidly travel outward.
- 4: Huge waves strike coastlines.
Listen again:
W: Today, I want to talk about tsunamis. For those of you who aren't familiar with the term, a tsunami is a series of gigantic, powerful waves that occur in the ocean. We'll start by looking at some of the causes of tsunamis, and then we'll discuss some of the effects they have. Tsunamis occur when a massive amount of water is displaced. This creates the waves that make up tsunamis. However, that's not the whole story. Something has to trigger… um, you know, cause… these displacements of water. Well, one trigger is meteor impacts. When a meteor falls into the ocean, it creates massive waves. Another common trigger is earthquakes, What often happens during earthquakes is that one part of the Earth's crust gets shoved upward. When the crust is shoved up in this way, it causes water displacement. Once that water is displaced, it travels outward in the form of a series of waves. The waves move away from the site where the displacement occurred. They, the waves, uh, carry tremendous force. If the waves strike any coastlines nearby, the result will be large-scale destruction.
