General Science: A Book of Projects

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Allyn and Bacon, 1921 - Project method in teaching - 398 pages
 

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Page 198 - Every body continues in its state of rest or of uniform motion in a straight line, except in so far as it may be compelled by impressed forces to change that state.
Page 384 - Those that have solidified beneath the surface are known as intrusive rocks. Those that have flowed out over the surface are known as effusive rocks. extrusive rocks, or lavas. The term volcanic rock Includes not only lavas but bombs, pumice, tuff, volcanic ash and other fragmentai matériels thrown out from volcanoes.
Page 231 - These simple machines are the lever, the wheel and axle, the pulley, the inclined plane, the wedge, and the screw.
Page 384 - Rocks formed by the accumulation of sediment in water (aqueous deposits) or from air (eolian deposits). The sediment may consist of rock fragments or particles of various sizes (conglomerate, sandstone, shale); of the remains or products of animals or plants (certain limestones and coal); of the product of chemical action or of evaporation (salt, gypsum, etc.); or of mixtures of these materials.
Page 87 - Calorie being the amount of heat necessary to raise the temperature of one gram of water one degree Centigrade.
Page 372 - LO Howard, chief of the Bureau of Entomology of the United States Department of Agriculture, and...
Page 203 - Arranged in the order of their distance from the sun, the planets are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.
Page 385 - Age of reptiles." Rise and culmination of huge land reptiles (dinosaurs), of shellfish with complexly partitioned coiled shells (ammonites), and of great flying reptiles. First appearance (in Jurassic) of birds and mammals; of cycads, an order of palmlike...
Page 241 - The efficiency of a machine is the ratio of the work done by the machine to the work put into the machine.
Page 355 - ... (Bot.). The conveyance of pollen from an anther of one flower to the stigma of another, either on the same or on a different plant of the same species.

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