This is probably easy but im not smart, so here Once organisms die, their organic remains are decomposed. If they are left under the earth with heat and pressure for millions of years they can become fossil fuels. What are three examples of these?

Why is earth's outer core hotter than earth’s oceanic crust? earth’s oceanic crust is denser than earth’s outer core is. earth’s oceanic crust has lava flowing from the mantle. earth’s outer core has a composition of solid iron and nickel. earth’s outer core is deeper within earth than oceanic crust is.