china inventions

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Across
  1. 2. has a magnetized needle that aligns itself with Earth’s magnetic poles so that one end points north and the other south.
  2. 4. an explosive powder made of saltpeter and other materials.
  3. 5. to protect against disease by transmitting a disease-causing agent to a person, stimulating the body’s defensive reactions.
Down
  1. 1. to make quantities of an item by using standardized designs and dividing steps of production among the workers.
  2. 3. - individual characters made of wood or metal that can be arranged to create a printing job and then be used over again.