The primary use of coal today in developed countries like the United States is...
a. Steam-powered engines, such as in trains and ships.
b. Household heat.
c. Electricity generation at coal-fired power plants.
a
d. Coal is no longer a widely-used fossil fuel.

Ascientist observes hot water erupting from a vent in the earth. what most likely caused the water to rise and erupt from the vent? the vent was lower than the water table. a well was drilled into a pressurized aquifer. a well with a mechanical pump was installed. the water was heated by magma or hot rocks.