Solar Turbines: Help Me Pick The Word!? (7/28/2011)

1. One of the problems in using solar energy is that it is difficult to (store/heat).
2. Turbines are a from of (water wheel/diesel engine).
3. Turbines are (more/less) efficient than gasoline engines.
4. All heat engines burn fuel to form a (n) (expanding/contracting) gas which pushes against a movable part.
5. (Auto/Diesel) engines use spark plugs to ignite a compressed air-gas mixture.

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