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# Earth shattering earthquakes

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### Transcript

• 1. Earth-shattering Earthquakes by Group 3
• 2. What is an earthquake? The text describes an earthquake as something that happens “when two blocks of earth suddenly slip past one another.” A fault is where this happens. The hypocenter is where the earthquake begins. The epicenter is the spot above the hypocenter.
• 3. Graphic #1: Diagram
• 4.  Graphic #1 shows layers of the Earth. This diagram shows that the hypocenter of an earthquake is below the surface of the Earth. It also shows that one “block” of earth might shift higher than another “block” of earth.
• 5. What causes earthquakes andwhere do they happen? This section explains that there are four layers of the Earth, which include the inner core, the outer core, the mantle, and the crust. The surface of the Earth is not just one large piece—“it is made up of many pieces like a puzzle.” The puzzle pieces are tectonic plates. Sometimes, plates get stuck. When they become “unstuck,” there is an earthquake.
• 6. Graphic #2: Diagram
• 7.  Graphic #2 shows the four layers of the Earth. This diagram helps the reader understand that these layers are not all the same size. It also shows the distance in km of each layer. The lithosphere is the smallest layer. The core, including the inner core and outer core, is larger than the mantle.
• 8. Why does the earth shake whenthere is an earthquake? When the edges of two faults are stuck, energy is stored up. When the two faults move, the stored energy comes out in waves. These seismic waves come “outward from the fault in all directions.” The text says these waves are “like ripples on a pond.” Then, these waves are what shake the Earth during an earthquake.
• 9. Graphic #3: Map
• 10.  Graphic #3 shows the different plates on the Earth. This map helps the reader understand that some of the plates are larger than continents. Also, some of the plates have more than one continent on them. It also shows that the oceans are on top of the plates.
• 11. What I would add: I would add photographs of what it looks like when an earthquake happens. I would even add photos of how earthquakes affect buildings and people’s homes.
• 12. Source: “The Science of Earthquakes.” US Geological Survey. 27 Oct. 2009. Web. 22 Mar. 2012.