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Extra resources for Britannica Learning Library Volume 04 - Technology and Inventions
Cause air _______. Generally, the faster that water moves, the more power it can generate. That’s why water flowing from a higher place to a lower place, as a waterfall does, can produce so much energy. Since ancient times humans have used the energy of water © Hubert Stadler/Corbis for grinding wheat and other grains. They first devised the waterwheel, a wheel with paddles around its rim. As the photograph shows, the wheel was mounted on a frame over a river. The flowing water striking the blades turned the wheel.
Some cotton fibers are so thin that just one pound of them can be spun into a thread 100 miles long! Work clothing and summer clothes are often made of cotton. Fine silk cloth is shiny and smooth. It costs more than cotton because silkworms need a lot of care. And each silkworm makes only a small amount of silk. Today weaving by hand has become mostly a specialized craft. As with much other manufacturing, modern cloth is usually produced by machines. LEARN MORE! READ THESE ARTICLES… BRAILLE • COMPUTERS • MEASUREMENT © Dave Bartruff/Corbis 44 © 2008 Encyclopædia Britannica, Inc.
READ THESE ARTICLES… AUTOMOBILES • ELECTRICITY • OIL THERMAL POWER The intense power of the Earth’s heat energy sometimes bursts into geysers—hot springs that send roaring columns of steam and boiling water high above the surface. S. DID YOU Answer: When steam escapes, it gives a mighty push. This push is so strong that it was used to move the early train engines. © 2008 Encyclopædia Britannica, Inc. ★ KNOW? Hot-air b allo the 1960 oning, a popula r sport in s, gas burn relies on therma l power.