EAS 217 F20

Public Group active 3 hours, 19 minutes ago

Global Impacts Video

Viewing 15 posts - 16 through 30 (of 44 total)
  • Author
    Posts
  • #95974
    Anzim Sultan
    Participant

    At points where there are three different diverging plates, what happens? Do all three plate combine create a massive zone of new seafloor production?

    -Anzim Sultan

     

    #95976
    Elihu Fleury
    Participant

    These were very informative videos.

    My questions are as follows – according to the Global Impacts video, the transform boundary that used to lie off the West Coast has now been absorbed by it. As time goes by, will this fault travel further inland into North America?

    Also, given all these ongoing plate movements, will a new version of Pangaea eventually form?

    #95978

    The videos for me were very interesting. It was a mix of reviewing the basic concepts and ideas we learned in class and previous lectures, and finding out new things that I didn’t know. For example, I always thought that any plate boundary would be hot because of the activity itself characteristic of every boundary. But in the “Plate Tectonics Basics” video is mentioned how the crust could be hot or cold in a convergent plate boundary.  It didn’t make sense to me that the crust could be cold considering there is melting happening in this type of boundary. But I understood later that it does make sense since this melting is occurring several meters down while is subducting under the other plate, and is cold on top since the crust would be several kilometers away from the hot divergent boundary/oceanic ridge it formed in the first place.

    Now, is the second video “Plate Tectonics Global Impacts” that mentioned hot spots and it remembered me about a daily doubt I have with the subject. The most common example to explain hot spots is Hawaii and the chain of volcanoes present. I always wondered, when the volcanoes move away from the hot spot, do they stop having magma right away? Can they still cause strong eruptions? Or eruptions at all? What’s the process exactly of becoming an inactive volcano?

    #95980
    Abigail Doris
    Participant

    These video are very informative and interesting.

    To clarify, why Atlantic ocean has only spreading?Why not subduction happening?

    -Abigail Doris

    #96041
    Nicco Valente
    Participant

    I was also wondering if there is some sort of model to predict when the next supercontinent will form and what it may look like. I do not think there is a specific equation for it, but after a quick google search I found that geologists have hypothesized what the next supercontinent may look. To answer your first question, there were other supercontinents before Pangea and there will be more to come.

    #96043
    Juliana Salvador
    Participant

    These two videos taught me a lot of interesting information. What I found really interesting was that 45 million years ago India collided with Asia and this collision is still going on today. This is causing the Himalayan Mountains to continue growing. I did not know that, and it made me think about how fast the Himalayan Mountains may be growing. Another question I had while watching the video on Plate Tectominc Global Impacts was what happens or what is present where the three ridge ocean centers meet in the Indian Ocean?

    #96044
    Mahmoud Ahmed
    Participant

    these videos shared some thoughtful knowledge about the place we are living in. However, if we are assuming that there were more than just one super-continent, why is Pangea the mainstream.

    #96046
    Lauren Liberty
    Participant

    I found it very interesting when it talked about the formation of the Himalayas and the volcanic mountain ranges in California and other along the coastal boundaries of other plates, yet one of the largest mountains was left out. Denali, or Mount McKinley, has a bigger body than Everest, more elevation gain from base to peak. I was wondering what would’ve caused such a large mountain to form there? I suppose it would’ve been something similar to the Himalayas, where two continental plates collided, if so which plates? I thought it surely would’ve been mentioned in the video if it was notable enough but alas, here we are.

    #96052
    Antony De La Cruz
    Participant

    In the videos we learnt that there are four different layers of Oceanic Crust: Pillow Basalts, Sheeted Basalt Dikes, Gabbro, and Sediments. Are there layers that can be identified in continental crust? Which of them are the same? The only one I can think of is the Sediments layer.

    #96138
    Michelle Wagner
    Participant

    What I found most interesting was water’s effect on the asthenosphere at a subduction zone. Because it reduces the melting point of the asthenosphere, it causes it to melt and the molten magma thereby becomes less dense and rises to the surface along with the water. The sheer amount of water at a subduction zone is what causes such explosive volcanoes to exist and my question is how much water is required to create such an explosion?

    #96267
    Rebecca Nguyen
    Participant

    I found it super interesting to learn about pangea and how our continent’s placement came to be. My favorite part of the video when they showed the triple junction where three different seafloor spreading centers come together and showed actual pictures where you can see the new rift zone appearing. It was mentioned that about 45 million years ago India collided into asia in a continent continent collision and is continuing to do so, and that made me wonder if it would ever stop? Also in millions of years from now, will the placement of the continents be completely different from how we see them now?

    #96276
    Sarah Pena
    Participant

    I personally found the subject of supercontinents quite interesting because it seems that (like everything else on earth) it is a cycle. The last supercontinent to form was Pangaea and there were six supercontinents that  have formed and dismantled before Pangaea was formed. Considering there is knowledge of the speed at which the continents move and which directions, is there a computer simulation that depicts a prediction of when  the next supercontinent forms and how it could possibly look like?

    #96288
    Julian Castillo
    Participant

    Something that I found interesting from the second video was that there was that there is a diverging spreading center on both the Northwest coast and in the Gulf of California in Mexico. From the simulation they played on the video, it looked as if land was moving in from the South-Southeast to make the west coast of America longer.  I know that plates move very slowly, at speeds of millimetres per seconds, so it would take thousands of years before it would be a noticeable difference, but does this imply that in some thousands of years later the west coast would have moved a sizable distance even further to the west?

    #96334
    Steven Kidder
    Participant

    It may be kind of like a boiling pot of soup. Sometimes the froth on top is all pushed over to one side (a lot of upwelling in one area)… but in the case of the Earth the froth is an insulator, so it can get hot under the supercontinent area, and this can eventually cause the supercontinent to break up again and spread out.

    #96339
    Steven Kidder
    Participant

    The EQ happen cluster along plate boundaries. The depth and intensity aren’t really related.

Viewing 15 posts - 16 through 30 (of 44 total)

You must be logged in to reply to this topic.

css.php
Need help with the Commons? Visit our
help page
Send us a message