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The correct sentence about petroleum and natural gas is: "They are found in rock folds underneath the ocean floor."

The correct sentence about petroleum and natural gas is:

- They are found in rock folds underneath the ocean floor.

To determine which sentence is correct about petroleum and natural gas, we need to have some understanding of their characteristics and how they are formed.

Petroleum, also known as crude oil, is a fossil fuel that is primarily formed from the remains of ancient marine organisms. Natural gas, on the other hand, is mainly composed of methane and is formed alongside petroleum.

Now, let's evaluate each sentence to determine its accuracy:

1. "They exist in the solid state."
This sentence is incorrect. Both petroleum and natural gas exist in the liquid or gaseous state, respectively. They are not found as solids.

2. "They are found in rock folds underneath the ocean floor."
This sentence is partially correct. Petroleum and natural gas deposits are often found in sedimentary rock formations, including rock folds. However, they are not exclusively located underneath the ocean floor. They can also be found on land.

3. "They are found through strip mining."
This sentence is incorrect. Strip mining is a method used to extract minerals and ores that are close to the Earth's surface, such as coal or certain types of metals. It is not used to extract petroleum or natural gas, as these resources are usually located deep underground.

4. "They are formed in low-pressure conditions."
This sentence is also incorrect. Petroleum and natural gas are formed under high-pressure and high-temperature conditions, usually in sedimentary basins or reservoirs. The organic material undergoes heat and pressure over millions of years, leading to the conversion into hydrocarbons.

Based on the evaluation of each sentence, the correct sentence is:
"They are found in rock folds underneath the ocean floor."
Although it is important to note that this statement is only partially correct since petroleum and natural gas deposits can also be found on land.