system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How is there enough oil under the ground to power hundreds of millions of cars, planes, boats..etc. daily?

I don't understand how there is THAT MUCH oil under the ground.

Think about it.

There are millions of cars all over the world, Los Angeles, New York, all the major cities in all the countries and all the suburbs... plus planes, trains, and other things that use oil... each are consuming hundreds of millions (billions?) of a gallons PER DAY.

So is the earth just a thin crust FILLED with OCEANS of oil?

I just don't get it.
gpt
The earth is BIG, compared to our oil consumption:
We consume 93,250,000 barrels a day of oil (not just gas) world wide.
At 42 gallons per barrels, that's 3,916,500,000 gallons used every day!

But!, the surface of the earth is 5.1 x 10^8 square kilometers. Oil has been found most everywhere, under land and water so lets assume there is oil under the crust everywhere.

If you took all the oil the world burns in a day, and spread it across the world, it would be only 1.1x10^-6 inches thick. Tha'ts 1000 times thinner then a human hair.

If their was only a inch of oil under the crust (which can be up to 50 km thick), it would supply us with oil for 8.75x10^5 days, or 2,400 years. This assumes our oil consumption doesn't increase.