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combustion or burning, in which substances combine chemically with oxygen from the air and typically give out bright light, heat, and smoke. -
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the activity or business of growing crops and raising livestock. -
the practice of applying controlled amounts of water to land to help grow crops, landscape plants, and lawns -
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The activity or sport of riding in a boat that's propelled by the wind is sailing. -
written language. -
these ancient marvels were likely built along a now-buried branch of the River Nile, concealed beneath desert sands and farmlands -
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Paper money can be traced back to the promissory notes of ancient China, Carthage, and the Roman Empire, over 2000 years ago -
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A windmill is a machine that harnesses the power of the wind. Windmills may be used to grind grain into flour, to pump water, or to produce electricity. -
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when the Declaration of Independence was approved by the Continental Congress. The written declaration stated that the American colonies were tired of being ruled by Great Britain. They wanted to become their own country. -
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Resembling a two-wheeled, horse-drawn chariot, the machine consisted of a vibrating cutting blade, a reel to bring the grain within its reach, and a platform to receive the falling grain. -
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a telecommunications device that enables two or more users to conduct a conversation when they are too far apart to be easily heard directly. -
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a machine with keys for producing alphabetical characters, numerals, and typographical symbols one at a time on paper inserted around a roller. -
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a device used to convert electricity into light, consisting of a source of illumination enclosed within a transparent or translucent shell, typically having a rounded shape and designed to be fitted into a socket in a lamp. -
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Diesel engines are typically much more fuel-efficient than gas engines, even those with very high compression ratios. -
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The vehicle was one of the first mass production vehicles, allowing Ford to achieve his aim of manufacturing the universal car. -
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A transatlantic flight is the flight of an aircraft across the Atlantic Ocean from Europe, Africa, South Asia, or the Middle East to North America -
a system for transmitting visual images and sound that are reproduced on screens, chiefly used to broadcast programs for entertainment, information, and education. -
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On July 20, 1969, humans walked on the Moon for the first time. We look back at the legacy of our first small steps on the Moon and look forward to the next giant leap. -
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a facility allowing computers, smartphones, or other devices to connect to the internet or communicate with one another wirelessly within a particular area. -
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shows you directions and uses real-time traffic information to find the best route to your destination. -
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