The Earth's Beginning
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In our eReader you can find the full English version of the book. Read The Earth's Beginning Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Earth's Beginning
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Even for this reason alone the internal vibrations might be ex- pected to accomplish their journey more rapidly than the superficial movements. With the same velocity they would take a shorter time for the journey. There is, however, another reason for the lesser time taken by the internal vibrations. Not only is the journey shorter, but the speed with which these vibrations travel through the solid earth is much greater than the speed with which superficial vibrations travel through the crust.... It has been shown that the average velocity of these vibrations when travelling through the centre of the earth is rather more than ten miles a second. The velocity 174 THE EARTH'S BEGINNING.
varies with the square root of the depth, and near the surface it is not two miles a second.
There are two points to be specially noticed. The vibrations, which, passing through the earth's interior with a high velocity, arrive as precursors, make a faithful diagram, but only on a very small scale.
We say that these vibrations have but small ampli- tude.
What to read after The Earth's Beginning?
You can find similar books in the "Read Also" column, or choose other free books by Ball, Robert S. (Robert Stawell), Sir, 1840-1913 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Even for this reason alone the internal vibrations might be ex- pected to accomplish their journey more rapidly than the superficial movements. With the same velocity they would take a shorter time for the journey. There is, however, another reason for the lesser time taken by the internal vibrations. Not only is the journey shorter, but the speed with which these vibrations travel through the solid earth is much greater than the speed with which superficial vibrations travel through the crust.... It has been shown that the average velocity of these vibrations when travelling through the centre of the earth is rather more than ten miles a second. The velocity 174 THE EARTH'S BEGINNING.
varies with the square root of the depth, and near the surface it is not two miles a second.
There are two points to be specially noticed. The vibrations, which, passing through the earth's interior with a high velocity, arrive as precursors, make a faithful diagram, but only on a very small scale.
We say that these vibrations have but small ampli- tude.
What to read after The Earth's Beginning?
You can find similar books in the "Read Also" column, or choose other free books by Ball, Robert S. (Robert Stawell), Sir, 1840-1913 to read onlineMoreLess
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