Describe the conditions that existed in the United States millions of years ago that resulted in the formation of the modern petroleum and natural-gas deposits

Explanation:

Millions of years ago, algae and plants lived in shallow seas. After dying and sinking to the seafloor, the organic material mixed with other sediments and was buried. Over millions of years under high pressure and high temperature, the remains of these organisms transformed into what we know today as fossil fuels.

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