______________were formed from the dead remains of living organisms millions of years ago

Fossil fuels are_____________ resources.

The amount of these resources in nature is limited. They can be ___________ by human activities. Examples of these resources are forests, wildlife, minerals, coal, petroleum, natural gas etc.

These resources are present in _________quantity in nature and are not likely to be exhausted by human activities. Examples are: sunlight, air.

some exhaustible natural resources like coal, petroleum and natural gas. These were formed from the dead remains of living organisms (fossils). So, these are all known as __________fuels.

sunlight is an example of______________

air is an example of________________

wildlife is an example of_____________

petroleum is an example of___________