Natural Resources

NATURAL RESOURCE

A natural resource is anything people can use which comes from nature. People do not make natural resources, but gather them from the earth. Examples of natural resources are air,water, wood, oil, solar energy, wind energy, hydro-electric energy, and coal. Refined oil is not a natural resource because people make it.
We often say there are two sorts of natural resources:renewable resources and non-renewable resources.
A renewable resource grows again or comes back again after we use it. For example, sunlight, water and wood are renewable resources.
A non-renewableresource is a resource that does not grow or come back, or a resource that would take a very long time to come back. For example, coal is a non-renewable resource.

RENEWABLE RESOURCE
A substance ofeconomic value that can be replaced or replenished in the same amount or less time as it takes to draw the supply down. Some renewable resources have essentially an endless supply, such as solarenergy, wind energy and geothermal pressure, while other resources are considered renewable even though some time or effort must go into their renewal, such as wood, oxygen, leather and fish. Most preciousmetals are considered renewable as well; even though they are not naturally replaced, they can be recycled because they are not destroyed during their extraction and use.
Renewable resources havebecome a focal point of the environmental movement, both politically and economically. Energy obtained from renewable resources puts much less strain on the limited supply of fossil fuels(non-renewable resources). The problem with using renewable resources on a large scale is a cost problem and in most cases, more research is needed to make their use cost-effective.

RENEWABLE RESOURCE
Arenewable resource is a resource which is replaced naturally.
Examples are: oxygen, fresh water, solar energy, timber, and biomass. They may become non-renewable resources if more is used than nature...