Question

put the steps of petroleum formation in their order of occurrence.
first
petroleum rose through layers of permeable rock until it became stuck in a geologic trap.
organic matter was buried beneath the ocean floor under layers of sediments.
over millions of years, intense heat and pressure caused a series of chemical changes that transformed organic matter into petroleum.
tiny marine organisms like algae and plankton died and sank to the ocean floor.
the remains of tiny marine organisms slowly decomposed into organic matter.

Explanation:

Petroleum formation starts with the death of marine organisms. Their remains decompose into organic matter. This organic matter is buried under sediments. Over millions of years, heat and pressure transform it into petroleum. Finally, petroleum moves through rocks and gets trapped.

Answer:

1. Tiny marine organisms like algae and plankton died and sank to the ocean floor.
2. The remains of tiny marine organisms slowly decomposed into organic matter.
3. Organic matter was buried beneath the ocean floor under layers of sediments.
4. Over millions of years, intense heat and pressure caused a series of chemical changes that transformed organic matter into petroleum.
5. Petroleum rose through layers of permeable rock until it became stuck in a geologic trap.