Which statement is true?
acombustion engines burn gasoline, a renewable resource, to power a vehicle.
bhydroelectric dams use the energy from blowing wind to generate electricity.
c many power plants burn fossil fuels, a renewable resource, to generate electricity.
d natural gas can be burned, producing hot gases that turn turbines to generate electricity.

This is kind of an awkward situation.

A, B, and C are definitely false:

A ... gasoline is not a renewable resource

B ... hydroelectric dams don't use wind for anything; windmills do

C ... fossil fuels are not renewable resources

So that leaves D, but D is partly absurd too.

Natural gas burning does not produce gases to turn the turbines.  Natural gas is burned to produce HEAT, just like on the stove in my kitchen.  The heat is used to boil water, and the steam from the boiling water is what turns the turbines to generate electrical energy.

But I guess you gotta pick  choice-D  as the answer.  

positive reinforcement? ?

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this