Fact 1: Producing thrust causes something to move.

Fact 2: Then the engine spins up and starts producing thrust.

Given the two facts above, answer the question "What do engines cause?" with the following options: 
- silence
 - Something to move
 - reproduction
 - birth
 - energy of moving objects
 - heat energy
 - Chemical energy
 - harmful substances


 

  Something to move       