Choose the words from the box and fill in the gaps.valuable,

Choose the words from the box and fill in the gaps.
valuable, petroleum extraction, renewable, coal, tax on consumption, raw materials, natural, forestry, fossil fuels, natural gas
Natural resources (economically referred to as land or 1______________) are naturally forming substances that are considered 2______________in their relatively unmodified (3_____________) form. Thus, mining, 4_____________, fishing, hunting and 5_____________ are generally considered natural-resource industries.
Natural resources are mostly classified into 6______________ and non-renewable resources. Sometimes resources are classified as non-renewable even if they are technically renewable, just not easily renewed within a reasonable amount of time, such as 7_____________.
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'. Different non-renewable resources like oil, 8_____________, 9_____________ etc. have different levels of demand from different sectors like transportation and residences with each resource specializing for each sector. Many environmentalists propose a 10_______________ of non renewable resources. Non-renewable resources cannot be replaced or can only be replaced over thousands or millions of years.