Question

why do coal and petroleum have to be mined from deep inside the earth? why are they called fossil fuels?

Answer 1

They called fossil fuels because the coal and petroleum is made up of dead plans or bodies and it get at the deep of the earth so coal and petroleum is also get in deep

Answer 2

They are called fossil fuels because they are formed by the decay of dead plants.and animals buried inside the Earth,s crust millions of years ago..Their formation undergoes in million of years.So the decay plants animals by the the chemical reactions is converted into fossil fuels..
They should be taken out by digging deep inside the Earth..by using various machineries..