WORLD HISTORY

Detailed explanation-1: -Crude oil is formed from the remains of dead organisms (diatoms) such as algae and zooplankton that existed millions of years ago in a marine environment. These organisms were the dominant forms of life on earth at the time.

Detailed explanation-2: -Oil has been used in one form or another over thousands of years but it has become really important to our economy in the last 2 centuries. It has been the most important source of energy since the end of World War II. The first oil well was created in the middle of the 19th century in Pennsylvania.

Detailed explanation-3: -About 300 million years ago, these dead organic materials such as zooplankton and algae built up on the bottom of lakes and oceans in conditions where they couldn’t decompose. The organic matter then changed into kerogen, which eventually turned into oil through heat and pressure.

Detailed explanation-4: -70% of oil deposits existing today were formed in the Mesozoic age (252 to 66 million years ago), 20% were formed in the Cenozoic age (65 million years ago), and only 10% were formed in the Paleozoic age (541 to 252 million years ago).