Question

How did the three types of Fossil Fuel occured in the Earth crust.

Answer 1

The four types of fossils are:

mold fossils (a fossilized impression made in the substrate - a negative image of the organism)

cast fossils (formed when a mold is filled in)

trace fossils = ichnofossils (fossilized nests, gastroliths, burrows, footprints, etc.)

Answer 2

Their remains gradually changed over the years due to heat and pressure in the earth crust and formed to coal , oil and gas .

These are the 3 major forms of fossil fuels and were formed from the organic remains of plants and animals... sometimes the fuel is burn in the engine.

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