By weight, a gem-stone quality diamond is more valuable than oil.
Venezuela's most valuable resource is oil.
Oil and natural gas.
Oil has many uses.
oil
Their oil!
oil.
Of the fossil fuels (coal, oil and natural gas).
oil
you can be if it is scarce and valuable at that time
They have lots of oil so they want to take advantage and sell the valuable oil . the oil is also very valuable in trade
it is oil