The sources of energy which have accumulated in nature over a very long period of time and which cannot be replaced quickly when exhausted are called-

Correct option is D

The correct answer is (d) Nonrenewable source of energy.
· Nonrenewable sources of energy are those that have taken millions of years to form and cannot be replenished on a human timescale once they are exhausted.
· Examples include fossil fuels like coal, oil, and natural gas.
· These energy sources are limited and cannot be quickly replaced because their formation involves complex geological processes over millions of years.
Characteristics of Nonrenewable Energy Sources:
· Finite in quantity: Once depleted, they cannot be replenished.
· High energy content: These sources are very efficient in terms of energy generation.
· Environmental impact: Their extraction and usage often lead to pollution and greenhouse gas emissions.