There is also solar energy in wood, oil, and coal. These fuels have been 49 People burn them to produce heat and to create power for machines. Oil and coal are used to produce electrical energy, too. And electricity produces light heat, and sound energy. In addition, electric power operates many kinds of equipment, tools, and machines, which make work easier.
If you made a list of all the jobs performed by the different kinds of energy, you would fill many pages. The need for power increases every day, and some sources of energy 50 So scientists and technicians are trying to find new ways to produce power.
A formed over many centuries from plants.
B returns it to the earth in the form of rain or snow.
C are being used up very quickly.
D there would be no life.
E produce mechanical energy and electricity.
F are being produced everyday
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