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Post by 1dave on Apr 27, 2023 2:56:07 GMT -5
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rocknewb101
fully equipped rock polisher
Member since October 2022
Posts: 1,328
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Post by rocknewb101 on Apr 27, 2023 7:06:13 GMT -5
1dave - this post is SO timely. Helping my daughter with her science last night and we learned all about P waves and S waves - learned S waves are slower, but cause more damage - it was quite an interesting lesson and one I had no idea on. I'll be sharing these videos with her to help solidify her knowledge.
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Post by 1dave on Apr 27, 2023 11:59:12 GMT -5
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Post by 1dave on Apr 28, 2023 0:52:40 GMT -5
Waves are a confusing subject because they intermix so many terms. P-waves, S-Waves, Plane waves, slow waves, fast waves, longitudinal waves, body waves, surface waves, elastic waves, compression waves, shear waves, Love waves, Rayleigh waves - There are two kinds of body waves:P-Waves and S-Waves. P-Waves are Primary waves because they are the first to arrive. They are also known as compression waves and longitudinal waves. S-Waves are Secondary waves because they get there later. They are also known as transverse and shear waves. There is something odd about them. P-waves travel fastest in wet rocks. S-waves travel fastest in dry rocks! There are two kinds of Surface Waves: Love and Rayleigh Earth is in part an Elastic Medium like water that readily takes different shapes, but can't be compressed, and air that can change its shape and size during a deforming force and return to its original shape after the removal of the deforming force. Newton's Third Law: For every action there is an equal and opposite reaction, so grains "spring forward and fall back" as the wave passes. I just finished this chart.
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rocknewb101
fully equipped rock polisher
Member since October 2022
Posts: 1,328
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Post by rocknewb101 on Apr 28, 2023 7:43:56 GMT -5
interesting!! Thanks, for sharing this. I feel like I'm in school again
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Post by 1dave on Apr 28, 2023 10:12:08 GMT -5
Seeing it "LIVE." This was taken 2 days after the worst storm of the summer, it took all the energy with it. So I think it works different on the lakes compared to the ocean. We get big ice shelf that builds up thru the winter and that pushes a large section of sand bar up to the front, you can see how many rocks are there after the ice melts compared to the summer. As spring arrives, the winter sand/rock bar starts to go back out.
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Post by 1dave on May 2, 2023 13:26:41 GMT -5
That chart has bugged me ever since I made it! I can't think in kilometers. I think in miles. 1 pace = the, distance of a full stride from the position of one heel where it raised off of the ground to where it set down again at the end of the step 125 paces = 1 furlong. 500 paces = 4 furlongs. 1,000 paces = 8 furlongs = 1 Roman mile. So I re-did it.
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