By Greg Young

During this beautiful biography, childrens will examine the interesting existence, theories, and discoveries of Alfred Wegener. From his time in Greenland learning meteorology with scorching balloons to his thought of Pangea, readers may be wanting to examine extra approximately Wegener's contributions to technology and the strides he took in the direction of constructing the research of plate tectonics. The easy-to-read textual content, obtainable word list, worthy index, and interesting evidence paintings along with the vigorous photos and beautiful lab job to have interaction readers from commencing to end!

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Energy Department sponsors a contest especially for sixth, seventh, and eighth graders. The contest is called the Junior Solar Sprint/Hydrogen Fuel Cell Car Competition. Teams of students build and race model cars that are run by solar power or hydrogen fuel cells. A solar-powered house at the Solar Decathlon. 43 GLOSSARY AC: Alternating current, a type of electric current, or flow of electricity, that reverses its direction many times a second. active method: A method for using solar energy that involves the use of electricity or machines—for example, a solar heating system that uses a pump.

More work is needed on the idea, but researchers say the system would be easy to manufacture and not too expensive. It might be ready for practical use within a few years. Advances in PV cells are an important reason why the use of sunshine to make electric power is expected to continue to grow in coming years. The use of sunshine is also likely to grow because of improvements in solar thermal power systems. Experts, however, do not expect the growth to be huge. Because solar power does not work when there is no sunshine, a power company cannot use it to supply what is called the base load.

13 Greenhouses 5, 14, 15; ill. 6 Grid 5, 6, 24, 25, 26, 31 Heat and heating 4, 6, 8, 15–17 conversion methods 21, 22 salt, use of 23 Hours of sunlight map 28 Hybrid energy systems 32 Hydrogen 9, 39, 40 Hydrogen fuel cells 39–40, 43; ill. 40 Kemp, Clarence 19 Land use 13, 25, 29, 34 Life, possibility of 4, 11 Metering 25, 33 Mirrors 16, 17, 21, 22, 23; ills. 15, 17, 21 Natural gas 7, 8; ill. 13 Nellis Air Force Base (Nevada) 19; ill. 18 Noise 26 Nuclear energy 8, 9, 10, 26, 27; ill. 13 Ohl, Russell 20 Oil 7, 8, 9; ill.

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Alfred Wegener. Uncovering Plate Tectonics by Greg Young

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