Is used to produce vs were used to produce

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Looking on the internet deeply has found these results:

is used to produce is the most popular phrase on the web. 

were used to produce

1292,000 results on the web

is used to produce

1511,000 results on the web

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Some examples and use cases from the internet:

Some examples and use cases from the internet:

  • ... 3.5 ounces of dye. Tyrean purple became the color of royalty. Lichens were used to produce ochril, a purple dye, which was called the “poor person's purple”.
  • How can I see the search parameters that were used to produce my compound identifications? If you want to see what search parameters were responsible for ...
  • ... by farmers were processed by users with household chemicals to make kompot ("Polish heroin"), and poppy seeds were used to produce koknar, an opiate.
  • Lard breeds were used to produce lard, a cooking fat and mechanical lubricant. These pigs were compact and thick, with short legs and deep bodies.
  • Apr 7, 2015 ... How much water is used to produce your food? Cutting animal products from our diet can significantly help water conservation efforts, but water ...
  • How much water is used to produce a single day's supply of U.S. newsprint? 300 million gallons. What is the total amount of water used to manufacture a new ...
  • One is to use power to gas where electric power is used to produce hydrogen from electrolysis and the other is landfill gas to produce hydrogen in a steam ...
  • Apr 16, 2015 ... How Much Water Is Used to Produce Our Food? Food News · Pin it. California's severe drought has prompted conservation efforts across the ...

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