they either use one of the folowing types: gamma, beta, alpha depending on the type of place they want to search. they send out the waves and if the signal they receive changes e.g. less signal coming in to the receptor then they know that something is located there and they dig it up to check. the procedure is different in other places but it is similar.
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It helps because seismic tomography is a technique used to look beneath Earth's crust so, they can technically "see" where oil deposits are located.
Oil Reserves are big and oil deposits are small.
Most of Canada's oil deposits are in northern Alberta
the countries that have deposits of coal and oil have the advantage to have coal to heat up homes, give a warming fire etc, and for countries that have oil deposits can have more petrol, cooking oil :), oil for lamps etc.
Maine does not have any oil deposits-well, at least no discovered oil deposits.
the gas is collect above the oil because it has less dense
Most oil deposits are located underground in tiny holes in sandstone or limestone. Because oil deposits are usually located deep below the surface.
Is the countries who have the oil deposit.
Deposits of oil and natural gas.
It is the easiest way to find oil deposits.
Austen,Texas would be the answer to; the largest oil deposits in north America