Elementary Lessons in Physical Geography
Format: Paperback
ISBN13: 9780217712644
Paperback|9780217712644
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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER II. LEssON VI.?Its Composition. 1. Above and around us, to what part soever of the earth's surface we may go, at the top of the highest mountain, as well as at the bottom of the deepest mine, we find ourselves surrounded by the invisible ocean of gas and vapour which we call Air. It therefore wraps the whole planet round as an outer envelope. Considered in this light it receives the distinctive name of the Atmosphere, that is, the vapour-sphere ? the region of clouds, rain, snow, hail, lightning, breezes, and tempests. In the study of the earth as a great habitable globe this outer encircling ocean of air is the first thing to be considered. What is it ? and what purposes does it serve in the general plan of the earth ? 2. In early times men regarded the air as one of the four elements out of which the world had been made. It is not so very long since this old notion disappeared. But now it is well known that the air is not an element, but a mixture of two elements?viz. the gases called Nitrogen and Oxygen, together with minute admixtures of other ingredients. It is easy to prove this by burning a piece of another element, phosphorus, in a jar immersed in water. We thereby remove the oxygen, which unites with the phosphorus to form a compound substance, and the nitrogen is left behind, while thewater rises about one-fifth in the jar, thereby indicating the proportion of oxygen which has been removed.1 In various ways chemists have analysed or decomposed air into its component elements, but the result is always the same, viz. that in every hundred parts of ordinary air there are by weight about seventy-nine of nitrogen and twenty-one of oxygen. 3. Oxygen plays various important parts in nature. It is the element in the air which sustains the life of all air- bre...
| ISBN-13 | 9780217712644 |
|---|---|
| ISBN-10 | 0217712649 |
| Weight | 0.77 Pounds |
| Dimensions | 9.00 x 6.00 x 0.53 In |
| List Price | $20.77 |
| Format | Paperback |
|---|---|
| Pages | 232 pages |
| Publisher | |
| Published On | 2009-08-01 |
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