Physical Geography

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Ivison, Blakeman, Taylor,, 1885 - Geography - 124 pages

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Page 2 - ... govern the situation, extent, outlines, and relief of the land-masses; the cause, the extent, the connection, and the influence of the great oceanic currents; the distribution of heat upon the surface of the globe ; the general atmospheric movements, and what is their cause, course, and influence ; what laws control the periods, distribution, and amount of rain upon different portions of the globe ; the general laws that govern the distribution of vegetable and animal life, and how all these...
Page 71 - During the day the earth receives from the sun more heat than it radiates into space; while during the night it radiates more than it receives. Hence a succession of long days and short nights results in an accumulation of heat, raising the average temperature and producing summer; while long nights and short days result in a temperature below the average, producing winter.
Page 91 - America has in the eastern half a greater amount of rain than either of the other northern continents in similar latitudes." . . " The great sub-tropical basin of the Gulf of Mexico sends up into the air its wealth of vapors to replace those lost by the winds in crossing the high mountain chains. Hence the eastern portions — the great basins of the Mississippi and the St. Lawrence and the Appalachian region — which, without this source of moisture, would be doomed to drought and barrenness, are...
Page 8 - ... this declination is said to be east or west, according as the north pole of the needle is eastward or westward of the astronomical meridian of the place.
Page 65 - The main causes of these vast movements in the ocean are found in the winds, the excessive evaporation within the tropics which tends to lower the level of the water there, and the differing temperatures of polar and equatorial regions.
Page 65 - ... water which rushes over the beach at a height sometimes of 60 feet, and carries everything before it, finishing the work of devastation wrought by the earthquake. 53. They are vast rivers in the sea, moving on steadily through the water, and often differing from the latter in color and temperature. Some are hundreds of miles broad, thousands of feet deep, and have a course embracing the larger part of the ocean through which they move. 54. The intense cold of the polar regions establishes a current...
Page 121 - The continents are made for human societies, as the body is made for the soul." Guyot writes: "The conclusion is irresistible, that the entire globe is a grand organism, every feature of which is the outgrowth of a definite plan of the all-wise Creator for the education of the human family, and the manifestation of his own glory.
Page 69 - There is difficulty at first in believing that a man's body should be bearing a pressure of fifteen pounds on every square inch of its surface, while he remains altogether insensible...
Page 69 - The atmosphere is a mechanical mixture of oxygen and nitrogen, in the proportion, by volume, of 21 parts of the former to 79 of the latter ; with a very small quantity of carbonic acid, and more or less of watery vapor held in suspensio n.
Page 8 - Magnets are substances which have the property of attracting pieces of iron or steel, and the term magnetism is applied to the cause of this attraction. Magnetism exists in a natural state in an ore of iron, which is known in chemistry as magnetic oxide of iron, or magnetite. This magnetic ore was first found by the ancients in Magnesia, a city in Asia Minor; hence, substances possessing this property have been called magnets. It was also discovered...

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