Norway has an important oil industry.
The North Sea.
siberia
oil
usa
Just about every product made has oil associated with it from making the plant and machinery, to being part of the product (plastics rubber etc) to the vehicle that distribute it world wide
oil
Oil and religion (Islam)
Oil
Oil
a geologist
The most important resource for the whole region is oil.
Oil.
Oil and Gas are Canada's #1 export but hockey is our most important product.
none of the above.
Oil.
Oil and freash water