By James Jackson Kilpatrick

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Name some facts that have been discovered about earth- quakes. Name three kinds of earthquake motion. Which is the most dangerous ? Describe the sounds which accompany earthquakes. What is the main cause of earthquakes ? To what other may they be attributed? What facts have been discovered respecting the period- causes icity of earthquakes? Give a short description of the earthquake which de- stroyed the city of Lisbon. Are any portions of the earth free from earthquake shocks ? In what parts of the earth are earthquake shocks most frequent ?

On account of the spherical form of the earth, a small part of its surface can receive the only vertical rays of the sun at the same time. This part can be regarded as nearly a point and since only one-half of the earth is lighted at any one ; time, the great circle of illumination must extend 90 in all directions from the point which receives the vertical rays. By rotation all portions of the surface situated anywhere within the tropics in the same latitude, at some time or another during the day, are turned so as to receive the vertical rays of the sun, and consequently, the portion so illumined has the form of a ring or zone.

Geysers are sometimes ranked with volcanic phenomena. They are described under Hot Springs. Fig. 23. is Fissures produced by the Charleston Earthquake of 1886, near the surface, probably never deeper than and often much less. ) on the energy of the shock, but also on the depth of its origin below the surface the deeper the : origin, the greater the area. ) is generally that in miles length. many direction of the motion at the surface often The nearly upward over the origin, and more inclined as the distance from the origin increases.

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A special study of the Portuguese Provinces: A Place for Pioneers by James Jackson Kilpatrick


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