Name Class Date. Earthquakes Earthquakes and Society
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1 CHAPTER 5 SECTION 3 Earthquakes Earthquakes and Society BEFORE YOU READ After you read this section, you should be able to answer these questions: Can scientists predict when earthquakes will happen? Why do some buildings survive earthquakes better than others? How can you prepare for an earthquake? National Science Education Standards ES 1b What Is Earthquake Hazard? Earthquake hazard tells how likely it is that a place will have a damaging earthquake in the future. Scientists look to the past to figure out earthquake-hazard levels. A place that has had a lot of strong earthquakes in the past has a high earthquake-hazard level. A place that has had few or no earthquakes has a much lower level. STUDY TIP Be Prepared As you read, underline important safety information that can help you to prepare for an earthquake. Earthquake Hazard Map of the Continental United States Highest earthquake-hazard level Lowest earthquake-hazard level TAKE A LOOK 1. Identify On the map, find the place where you live. What is its earthquake-hazard level? Look at the map above. Notice that California has the highest earthquake-hazard level in the country. The San Andreas Fault Zone runs through most of California, and a lot of earthquakes happen there. Minnesota has a very low earthquake-hazard level. Very few strong earthquakes have been recorded in Minnesota. Interactive Textbook 93 Earthquakes
2 Can Scientists Predict Earthquakes? You know that earthquakes have different magnitudes. You can probably guess that earthquakes don t happen on a set schedule. But what you may not know is that the strength of earthquakes is related to how often they happen. Scientists can t predict earthquakes. However, by looking at how often earthquakes have happened in the past, they can estimate where and when an earthquake is likely to happen. Look at the table below. It shows the number of earthquakes of different sizes that happen every year. There are many more weak earthquakes than strong earthquakes every year. Math Focus 2. Calculate About how many times more light earthquakes than strong earthquakes happen every year? Description Magnitude on the Richter scale Great 8.0 and higher 1 Major 7.0 to Strong 6.0 to Moderate 5.0 to Light 4.0 to 4.9 6,200 Minor 3.0 to ,000 Very minor 2.0 to ,000 Average number per year Scientists can guess when an earthquake will happen by looking at how many have happened in the past. For example, if only a few strong earthquakes have happened recently in an earthquake zone, scientists can guess that a strong earthquake will happen there soon. Critical Thinking 3. Apply Concepts What do you think makes strong earthquakes more likely to happen in seismic gaps? What Is the Gap Hypothesis? Some faults are very active. They have a lot of earthquakes every year. These faults sometimes have very strong earthquakes. A part of an active fault that hasn t had a strong earthquake in a long time is called a seismic gap. The gap hypothesis says that if an active fault hasn t had a strong earthquake in a long time, it is likely to have one soon. In other words, it says that strong earthquakes are more likely to happen in seismic gaps. Interactive Textbook 94 Earthquakes
3 How Do Earthquakes Affect Buildings? Have you ever seen pictures of a city after a strong earthquake has hit? You may have noticed that some buildings don t have very much damage. Other buildings, however, are totally destroyed. Engineers can study the damage to learn how to make buildings that are stronger and safer. Critical Thinking 4. List Give three factors that can affect how much a building will be damaged by an earthquake. A mass damper is a weight that is placed in the roof of a building. Computers can sense when the building is moving. The computers move the mass damper around to help keep the building from moving too much. Steel cross braces are found between the floors in a building. They help to keep the building from breaking when it moves from side to side. Flexible pipes can help to prevent water lines and gas lines from breaking. The pipes can bend and twist without breaking. An active tendon system is like a mass damper, except it is placed under the building. TAKE A LOOK 5. Compare How is a mass damper different from an active tendon system? Base isolators can absorb energy during an earthquake. They keep seismic waves from moving through the building. Base isolators are made of rubber, steel, and lead. Interactive Textbook 95 Earthquakes
4 6. Explain Why is it important to make and practice an earthquake plan? How Can You Prepare for an Earthquake? If you live in a place where earthquakes happen often, you and your family should have an earthquake plan. You should practice your plan so you will be prepared if an earthquake happens. How Can You Make an Earthquake Plan? There are several things to include in your earthquake plan. SAFE HOME Put heavy things near the floor so that they do not fall during an earthquake. Make sure things that can burn are kept away from electric wires and other things that can start a fire. 7. Identify Think about your bedroom. Write down a safe place in your bedroom that you can go during an earthquake. SAFE PLACES IN YOUR HOME Make sure you know a safe place in each room in your home. Safe places are areas far from windows or heavy objects that could fall or break. PLAN TO MEET OTHERS Talk to your family, friends, or neighbors and set up a place where you all will meet after an earthquake. If you all know where to meet one another, it will be easy to make sure that everyone is safe. TAKE A LOOK 8. List List four foods that would be useful to have in an earthquake kit. EARTHQUAKE KIT Your earthquake kit should have things that you might need after an earthquake. Remember that you may not have electricity or running water after an earthquake. What Should Be in an Earthquake Kit water food that won t go bad a fire extinguisher a small radio that runs on batteries medicines a flashlight with batteries extra batteries for the radio and flashlight a first-aid kit Interactive Textbook 96 Earthquakes
5 What Should You Do During an Earthquake? If you are inside when an earthquake happens, crouch or lie facedown under a table or a desk. Make sure you are far away from windows or heavy objects that might fall. Cover your head with your hands. If you are outside during an earthquake, lie face down on the ground. Make sure you are far from buildings, power lines, and trees. Cover your head with your hands. If you are in a car or bus, you should ask the driver to stop. Everyone should stay inside the car or bus until the earthquake is over. 9. List Look around your classroom. List two places that you could go in case of an earthquake. Say It Share Experiences Have you ever been in an earthquake? In a small group, talk about what it was like. What Should You Do After an Earthquake? Being in an earthquake can be scary. After an earthquake happens, people are often confused about what happened. They may not know what to do or where to go. After an earthquake, try to stay calm. Look around you. If you are near something dangerous, like a power line or broken glass, get away as quickly as you can. Never go into a building after an earthquake until your parent, a teacher, a police officer, or a firefighter tells you it is safe. Always remember that there could be aftershocks. Aftershocks are weaker earthquakes that can happen after a large earthquake. Even though they are weaker than the main earthquake, aftershocks can still be very strong and damaging. Stick to your earthquake plan. Stay together with your family or friends so that they know you are safe. 10. Identify Who should you ask if you want to know whether it is safe to go back into a building after an earthquake? Interactive Textbook 97 Earthquakes
6 Section 3 Review NSES ES 1b SECTION VOCABULARY gap hypothesis a hypothesis that is based on the idea that a major earthquake is more likely to occur along the part of an active fault where no earthquakes have occurred for a certain period of time seismic gap an area along a fault where relatively few earthquakes have occurred recently but where strong earthquakes have occurred in the past 1. Identify Why are seismologists interested in seismic gaps? 2. Describe Fill in the chart below to show what you should do during an earthquake. If you are......inside a building Then you should......in a car or bus...lie face down on the ground with your hands on your head, far from power lines or fire hazards. 3. Identify What do engineers do to learn how to make a building more likely to survive an earthquake? 4. Identify Relationships What is the relationship between the strength of an earthquake and how often it occurs? 5. Infer In most cases, you should stay inside a car or a bus in an earthquake. When might it be best to leave a car or a bus during an earthquake? Interactive Textbook 98 Earthquakes
7 F Inside the Restless Earth Answer Key continued 5. Magnitude is the strength of an earthquake, but intensity is how much damage it causes. A moderate earthquake can cause a lot of damage if it happens in a place with weak soil or non-earthquake-resistant buildings. EARTHQUAKES AND SOCIETY 1. Answers will vary. 2. about 50 times more 3. If an active fault hasn t had a strong earthquake in a long time, pressure is building up. More pressure leads to stronger earthquakes. 4. height, mass, composition, location 5. A mass damper is placed at the top of a building. An active tendon system is in its basement. 6. You will know what to do in an earthquake. 7. Possible answers: doorway, under a desk or table 8. any nonperishable food 9. Possible answers: under the desk, in the doorway 10. a parent, teacher, police officer, or firefighter Review 1. Earthquakes are more likely to occur in seismic gaps than in other places. 2. If you are... Then you should......inside a building...outside...in a car or bus...crouch or lie face down under a desk or table, away from glass or heavy objects; cover your head with your hands...lie face down on the ground with your hands on your head, far from power lines or fire hazards...ask the driver to pull over and stop; stay inside the car or bus until the earthquake is over 3. They look at the damage to other buildings from earthquakes. 4. Small earthquakes occur much more often than large earthquakes. 5. Possible answers: The car is on fire; the car is in a dangerous location (e.g., railroad tracks). Chapter 6 Volcanoes SECTION 1 VOLCANIC ERUPTIONS 1. a body of magma below a volcano 2. hardened lava flows 3. nonexplosive 4. Explosive eruptions are less common. Explosive eruptions produce ash and dust instead of lava. 5. magma composition 6. It can block the volcano s vents, causing pressure to build up. 7. Water: More water makes explosive eruptions more likely. Silica: More silica makes explosive eruptions more likely. 8. hardened magma that is blasted into the air 9. They both have sharp edges. 10. Small pieces of lava harden before they hit the ground. 11. about 120 mi/h Review 1. Lava is magma that flows on the Earth s surface. 2. explosive and nonexplosive 3. Magma with a lot of water is likely to erupt explosively. 4. It is thinner and runnier, so gases can escape more easily. 5. Both are lava flows with smooth surfaces. Pillow lava forms underwater. Pahoehoe forms on land. 6. Large blobs of magma harden in the air. 7. Pressure builds up inside bubbles in magma. When the pressure gets high enough, the bubbles shatter, producing tiny fragments of rock. 8. a fast-moving river of hot ash and dust from a volcano 9. explosive SECTION 2 EFFECTS OF VOLCANIC ERUPTIONS 1. Ash and dust in the atmosphere block sunlight, preventing it from reaching Earth s surface. 2. Layers of lava from nonexplosive eruptions build up into a mountain. 3. pyroclastic material 4. explosive eruptions 5. They are made of layers of different materials. 6. ash and lava 7. a funnel-shaped pit around the central vent of a volcano Interactive Textbook Answer Key 42 Inside the Restless Earth
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