Based on 8 Vocabulary Practice, Ex. 3.

Cross the odd one out

1. • nuclear,
   • chemical,
   • chain,
   • molecule
2. • oil,
   • gas,
   • water,
   • coal
3. • wind,
   • solar,
   • hydroelectric,
   • heat
4. • heat,
   • temperature,
   • electricity,
   • thermometer