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1. 
COAL IS A _________ SOURCE OF ENERGY.
2. 
GEOTHERMAL TERMPERATURE IS A _________ SOURCE OF ENERGY.
3. 
OIL IS A _________ SOURCE OF ENERGY.
4. 
WATER IS A _________ SOURCE OF ENERGY.
5. 
WIND IS A _________ SOURCE OF ENERGY.
6. 
NATURAL GAS IS A _________ SOURCE OF ENERGY.
7. 
THE SUN IS A _________ SOURCE OF ENERGY.
8. 
BIOMAS IS A _________ SOURCE OF ENERGY.