Flow renewable resources are very much like renewable resources, only they do not need regeneration, unlike
renewable resources. Flow renewable resources include renewable energy sources such as the following renewable
power sources: solar, geothermal, biomass, landfill gas, tides and wind.
Resources can also be classified on the basis of their origin as biotic and abiotic. Biotic resources are derived
from living organisms. Abiotic resources are derived from the non-living world (e.g., land, water, and air). Mineral
and power resources are also abiotic resources some of which are derived from nature.
A non-renewable resource is a natural resource that exists in a fixed amount that cannot be re-made, re-grown or
regenerated as fast as it is consumed and used up.
Some non-renewable resources can be renewable but take an extremely long time to renew. Fossil fuels, for example,
take millions of years to form and so are not practically considered renewable.
Natural resources are natural capital converted to commodity inputs to infrastructural capital processes. They
include soil, timber, oil, minerals, and other goods taken more or less from the Earth. Both extraction of the
basic resource and refining it into a purer, directly usable form, (e.g., metals, refined oils) are generally
considered natural-resource activities.