Principles of Geology Or the Modern Changes of the Earth And Its Inhabitants C
Principles of Geology Or the Modern Changes of the Earth And Its Inhabitants C
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It has also been inferred from certain inequalities in the moon's motion, that there is a regular increase in density from the surface towards the centre, and that the equatorial protuberance is continued inwards ; that is to say, that layers of equal density are arranged elliptically, and symmetrically, from the exterior to the centre.
The mean density of the earth has been computed by Laplace to be about 5J, or more than 5 times that of water. Now the specific gravity of many of our rocks is ...from 2 J to 3, and the greater part of the metals range between that density and 21. Hence some have imagined that the terres- trial nucleus may be metallic that it may correspond, for example, with the specific gravity of iron, which is about 7. But here a curious question arises in regard to the form which materials, whether fluid or solid, might assume, if subjected to the enormous pressure which must obtain at the earth's centre. Water, if it continued to decrease in volume * See Hennessy, On Changes in Dublin, 1849 ; and Proc.
What to read after Principles of Geology Or the Modern Changes of the Earth And Its Inhabitants C?
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To quickly assess the difficulty of the text, read a short excerpt:
It has also been inferred from certain inequalities in the moon's motion, that there is a regular increase in density from the surface towards the centre, and that the equatorial protuberance is continued inwards ; that is to say, that layers of equal density are arranged elliptically, and symmetrically, from the exterior to the centre.
The mean density of the earth has been computed by Laplace to be about 5J, or more than 5 times that of water. Now the specific gravity of many of our rocks is ...from 2 J to 3, and the greater part of the metals range between that density and 21. Hence some have imagined that the terres- trial nucleus may be metallic that it may correspond, for example, with the specific gravity of iron, which is about 7. But here a curious question arises in regard to the form which materials, whether fluid or solid, might assume, if subjected to the enormous pressure which must obtain at the earth's centre. Water, if it continued to decrease in volume * See Hennessy, On Changes in Dublin, 1849 ; and Proc.
What to read after Principles of Geology Or the Modern Changes of the Earth And Its Inhabitants C?
You can find similar books in the "Read Also" column, or choose other free books by Charles Lyell to read onlineMoreLess
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