Fact 1: Aairplane is used for moving people across bodies of water.

Fact 2: Most airplanes use gas turbines.

Given the two facts above, answer the question "_ are used for moving people across bodies of water." with the following options: 
- dolphins
 - engines
 - gas turbines
 - electricity
 - streams
 - rivers
 - arteries
 - animal transport


 

   gas turbines      