File:Elementary physical geography; (1908) (14597853068).jpg

Identifier: elementaryphysic01redw (find matches)
Title: Elementary physical geography;
Year: 1908 (1900s)
Authors: Redway, Jacques Wardlaw, 1849- (from old catalog)
Subjects: Physical geography
Publisher: New York, C. Scribner's sons
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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A PORTION OF THE MOONS SURFACE solid, liquid, and gaseous—and nearly every chemical element and manyof their compounds may assume each of these forms. In the solid formthe molecules are bound by a strong cohesion; in the liquid form theyare slightly cohesive; in the gaseous form they repel one another.Most of the substances that in the earth are solids, in the sun exist aswhite-hot vapors. Although the assumed formation of the solar system by either processis a matter of theory, both theories are supported by evidence. Thetelescope reveals many such masses of gaseous matter showing planetary
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A SPIRAL NEBULA—CANES VENATICI 14 PHYSICAL GEOGRAPHY formation. The spectroscope, an instrument for analyzing a substanceby the kind of light which it emits, reveals not only the mutter of whichthe nebulae are composed, but also that the matter is in rapid motion.Calcium, hydrogen, iron, and sodium, the substances of greatest abund-ance in the sun, are also among the most abundant substances of theearth. The Form of the Earth.—The earth is one of theplanets. From Table I: (Appendix), find how it ranksamong the other planets in size;—in distance from the sun.Like the other planets, it is nearly spherical, but slightly-flattened at the poles. It is usually said to be an oblalespheroid—that is, a flattened sphere. As it deviates slightlyfrom this form, the term geoid is sometimes used to designateits irregular shape. The spherical form of the earth is shown in variousways; it is best demonstrated by surveying a horizontalstraight line along a level surface, such as that of a pond

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