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    Question ID:   3660         Current Version: 1
Question: How oil was formed?
Category: Science > Earth Sciences
Keywords: petroleum, crude, oil, natural, gas, form, formation
Type: how
Rating:(0 ratings)    Views: 659    Discussions: 0   In Watch Lists: 1  

 
    Answer:

Oil was formed from the remains of animals and plants that lived millions of years ago in a marine (water) environment before the dinosaurs. Over the years, the remains were covered by layers of mud. Heat and pressure from these layers helped the remains turn into what we today call crude oil . The word "petroleum" means "rock oil" or "oil from the earth."

Ocean: 300-400 million years ago

Tiny sea plants and animals died and were buried on the ocean floor. Over time, they were covered by layers of silt and sand.

Ocean: 50-100 million years ago

Over millions of years, the remains were buried deeper and deeper. The enormous heat and pressure turned them into oil and gas.

Today

Today, we drill down through layers of sand, silt, and rock to reach the rock formations that contain oil and gas deposits. 

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