Steam turbine engines were an important development in the late ...

[fahad]

Steam turbine engines were an important development in the late 1800s because ____.
 
 

a. they operated with a low pressure system that was safer than what was used before
  b. their spinning action was almost soundless
  c. they allowed boats to travel at speeds over 100 knots
  d. they became the main source of electricity production in the U.S.

Question 2

Which type of coal below is described accurately?
 
 

a. Anthracite  less dense and very brittle
  b. Bituminous  black, shiny and dense
  c. Lignite  a dull black low-density coal
  d. Anthracite  black, shiny and dense

[patma1981]

Answer to Question 1

D

Answer to Question 2

D

[fahad]

Thanks

[patma1981]

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