energy storage

1.      An effective way of producing power is to use energy from the sun.

1.      At the North and South Poles, water becomes from a liquid to a solid state. 

1.      If you raise the temperature of water to 100 degrees Centigrade, it boils.

1.      This power station uses energy produced by atomic fission to generate electricity.

Oil is physical matter found under the surface of the earth.

1.      In order to make a fire, some kind of combustible material such as wood is needed.

1.      If you lubricate an engine, it will function more effectively..