Which of these energy sources is formed from decayed and compressed plankton?A.BiomassB.CoalC.GeothermalD.Natural gasSUBMITarrow_backPREVIOUS

The correct answer is D. Natural gas.

Natural gas is a fossil fuel that primarily consists of methane and is formed from the remains of ancient marine organisms, specifically plankton, that have decayed over millions of years under layers of sediment. Over time, the heat and pressure of the Earth's crust cause these organic materials to transform chemically, resulting in the formation of natural gas and oil.

In contrast:

• A. Biomass refers to organic materials, such as plant and animal matter, that can be used for energy but does not specifically involve the decomposition of marine organisms.
• B. Coal is the result of decayed plant matter, primarily from terrestrial sources, not marine organisms.
• C. Geothermal energy is derived from the heat contained within the Earth and is not related to decayed organic matter.

Therefore, among the options provided, natural gas is uniquely associated with the decay of planktonic life forms in ancient oceans.