Fill in the blanks in the following sentence:
Petroleum, _ and ___ are fossil fuels.

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Answer: coal, natural gas

Petroleum, coal and natural gas are fossil fuels. They are fuels that took hundreds of thousands of years to form from organic matter under high temperature and pressure conditions.

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Fill in the blanks in the following sentence:Petroleum, _______ and _________ are fossil fuels.

Answer: coal, natural gasPetroleum, coal and natural gas are fossil fuels. They are fuels that took hundreds of thousands of years to form from organic matter under high temperature and pressure conditions.

Fill in the blanks in the following sentence:
Petroleum, _ and ___ are fossil fuels.

Answer: coal, natural gas

Petroleum, coal and natural gas are fossil fuels. They are fuels that took hundreds of thousands of years to form from organic matter under high temperature and pressure conditions.