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Machines Then and Now
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pottery
Objects (usually vessels) made of clay and hardened by firing
arrow
thin stick with a sharp point at one end, which is shot from a bow
Communication
A process through which you send messages to and receive messages from others.
coal
a black or dark brown rock consisting mainly of carbonized plant matter, and widely used as fuel.
fuel
a material that releases energy when it burns
windmill
An engine powered by the wind designed to produce energy from an inexhaustible source.
watermill
a building next to a river containing machinery for grinding grain into flour
medicine
Any drug used to cure, prevent, or treat illness or discomfort
flour
fine white or brown powder made from grain, especially wheat, and used in cooking for making bread, cakes, etc.
steam
e hot gas that water changes into when it boils
smoke
the cloud of black, gray, or white gases and dust that is produced by burning something
satellite
An object that revolves around another object in space
chariot
a two-wheeled vehicle pulled by a horse
pendulum
something that hangs and swings back and forth
cart
(US) a metal structure on wheels that is used for carrying things
canal
an artificial waterway
batteries
Stores energy and changes it into electricity.
axle
Bar on which a wheel turns.
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