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Geology

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Oct 30, 2023

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The Core (2003) Video Response Questions Disasters: Geology vs. Hollywood Introduction For reasons unknown, the earth's outer core has stopped rotating, causing the planet's electromagnetic field to rapidly deteriorate. Instantly, life around the globe begins to change dramatically. In Boston, 32 people with pacemakers, all within a 10-block radius, suddenly drop dead. In San Francisco, the Golden Gate Bridge collapses, sending hundreds of people plunging to their deaths. In London's Trafalgar Square, flocks of pigeons lose their ability to navigate, flying into panicked crowds, slamming into windshields and causing drivers to lose control of their cars. And in Rome, as thousands of tourists watch helplessly, an electrical superstorm reduces the ancient Roman Colosseum to rubble. Scrambling to resolve the crisis, government and military officials call upon geophysicist Dr. Josh Keyes and a team of the world's most gifted scientists to travel into the earth's core in a subterranean craft piloted by "terranauts" Major Rebecca "Beck" Childs and Commander Robert Iverson. Their mission: Detonate a nuclear device that will reactivate the core and save the world from sure destruction. -imdb.com Learning Objective ● Assess the validity/credibility of statements made in Hollywood movies. (4, a) ● Identify the correct geologic processes that would help explain scenes in Hollywood movies. (1, 5, a, b) Questions During and after watching the video clips, answer the following questions. Add your answers below and submit on Canvas. 1. Dr. Keyes uses a cut peach to demonstrate the layers of the Earth. Other than the obvious issue (which he kind of addresses) about there being no liquid outer core in the peach, do you think this analogy is basically sound? Yes this is a good analogy there does not need to be a liquid butter core in the peach for the people in the room to understand what Dr. Keyes is talking about. 1. List at least 3 consequences that Dr. Keyes says will result from the loss of the magnetic field. Everything electronic will be fried. Super storms will start to happen from static discharge in the atmosphere. We won’t be protected from solar winds and microwave radiation will cook the earth. 2. Based on what we talked about in lecture and the behavior of the magnetic field over the course of Earth’s history, do you think Dr. Keyes’ prediction that “ life on Earth will end in a year ” is realistic? Why or why not? I believe that Dr. Keyes prediction was accurate but I can’t remember specifically what we talked about in class. If the magnetic field disappeared all of those things would happen. 1. The ship Virgil crashes inside a giant geode or “gem bubble” in the mantle. Could that large void of empty space really exist at that depth? Explain your answer. No it isn’t likely for a geode to form in the earths mantle at that depth with temperatures that high. Geodes usually form in rocks that are closer to the surface of the earth which have more realistic opportunities for a cavity like this to develop. The pressure and temperature inside of the mantle make it near impossible for a gem bubble to form. 2. The terranauts encounter the giant geode at approximately 700 miles (roughly 1127 km) depth, and they state that the temperature is 5000 degrees. They don’t specify whether that is Fahrenheit or Celsius, but let’s assume Fahrenheit since he uses that earlier in the film. So, that’s roughly 2760 degrees Celsius. Is this an accurate temperature estimate for that depth (feel free to refer to our lecture notes)? Yes this is an accurate temperature for the mantle at that depth. 3. At the end of the film (spoiler alert), our heroes do manage to save the world. Virgil emerges from the Earth’s interior at “a space between some tectonic plates somewhere near Hawaii.” Why is that impossible? Them going into the earth all the way to the core was unrealistic to begin with because of the pressure and temperature for them to leave is even more unrealistic because the same way they created to go down into the core would be closed from the pressure. The pull from the earths metal core would also make it harder to leave. 4. Describe anything else you saw in these clips that you think might be scientifically questionable.

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