Fill in the blank spaces given to complete each sentence.

1. A substance becomes a resource if it has …………..
2. ………….. and …………. are two important factors which make a substance a resource.
3. On the basis of the level of development, resources are classified into ……………. and …………..
4. An actual resource to crazy might have been a ……………. resource some time ago.
5. Windmills generate …………..energy which is a resource because it will never end up.
6. Although renewable resources can be replenished, we should be …………… regarding their use.
7. Coal and petroleum are examples of ………….. resources.
8. Air is a ubiquitous resource since it is found ………………..
9. Physical factors affecting the presence of a localised resource are …………….., ………………, and ……………
10. Using resources carefully and giving them time to get renewed is called ………………..