Energy is the ability to do work. It can take a variety of forms:mechanical, electrical, chemical, and nuclear. To produce any type of energy, the resources of the earth are used. The main resources of the earth are fossil fuels such as natural gas, oil, and coal.
Which of the followings hasn't been mentioned in the paragraph?
1 )
types of energy
2 )
earth resources
different uses of mechanical energy
4 )
definition of energy