Below the Ground and at the Bottoms of Seas
Fossil fuels, such as coal, oil, and natural gas, are typically found below the ground and at the bottoms of seas. Here is a breakdown of where they are usually located:

Below the Ground:
- Coal: Coal is primarily found underground in coal mines. It is formed from the remains of plants that lived and died millions of years ago. The pressure and heat from the earth's crust turned these plant remains into coal over time.
- Oil: Oil is usually found deep underground in reservoirs. It is formed from the remains of tiny sea creatures that died and sank to the ocean floor millions of years ago. Over time, the pressure and heat transformed these remains into oil.
- Natural Gas: Like oil, natural gas is also found underground in reservoirs. It is formed from the same organic material as oil but at higher temperatures and pressures.

At the Bottoms of Seas:
- Some fossil fuels, particularly oil and natural gas, can also be found at the bottoms of seas and oceans. These deposits are usually the result of ancient marine organisms decaying and being buried under layers of sediment over millions of years.
In conclusion, fossil fuels are primarily located below the ground in mines and reservoirs, as well as at the bottoms of seas and oceans. These natural resources have played a crucial role in powering our society, but their extraction and use also have significant environmental impacts.

Explanation:
Introduction:
Fossil fuels are energy sources that are formed from the remains of plants and animals that lived millions of years ago. They are non-renewable resources and are important sources of energy for electricity generation, transportation, and heating.
Location of fossil fuels:
Fossil fuels are typically found in specific locations. The correct answer to the given question is option D, which states that fossil fuels are found both below the ground and at the bottoms of the sea. Let's explain each location in detail:
Below the ground:
1. Fossil fuels like coal, oil, and natural gas are primarily found underground.
2. Coal is formed from the remains of ancient trees and plants that were buried and subjected to heat and pressure over millions of years.
3. Oil and natural gas are formed from the remains of microscopic marine organisms that lived in ancient oceans. These organisms were buried under layers of sediment and transformed into hydrocarbons.
At the bottoms of the sea:
1. Oil and natural gas can also be found in offshore areas, specifically at the bottoms of the sea.
2. Ancient marine organisms, such as plankton, accumulated on the ocean floor over millions of years and were eventually transformed into oil and natural gas through geological processes.
3. These offshore reserves are often accessed through drilling platforms and pipelines.
Conclusion:
Fossil fuels are primarily found below the ground and at the bottoms of the sea. They are formed from the remains of ancient plants and animals and are important sources of energy for various human activities. Recognizing the locations of fossil fuels is crucial for their extraction and utilization.