Answer :
The answer to the above question, is C. the main two sources are wind and sun (wind turbine and solar panels).
The two sources of energy for the earth's system are he sun and wind.
an internal source and an external source.
What are the 2 sources of energy for the earth system?
The earth is a vast, complex system powered by two sources of energy: an internal source (the decay of radioactive elements in the geosphere, which generates geothermal heat) and an external source (the solar radiation received from the Sun).
Thus, option "C" is correct.
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