A natural source providing us energy continuously is called –
(a) non-renewable
(b) conventional
(c) renewable
(d) none of the above

(c) renewable

Reason — From the point of view of availability, the various sources of energy are classified into the following two groups —

1. Renewable or non-conventional sources of energy — are sources from which energy can be obtained continuously over a long period of time.
2. Non-renewable or conventional sources of energy — sources from which energy cannot be continuously obtained over a long period of time.