Question

4 which of the following forms of energy is an example of a primary energy source? elastic thermal sound skip 3/12 complete

Explanation:

Primary energy sources are those that exist in nature prior to any human - made conversion or transformation. Elastic, thermal, and sound energies are secondary energies that are derived from primary energy sources through some form of energy conversion process. There are no primary energy sources among the given options.

Answer:

None of the above options are primary energy sources.