What's this TYPE of energy?
Wind
What's this TYPE of energy?
Water
What's this TYPE of energy?
Sun
What's this SOURCE of energy?
Solar energy
What's this SOURCE of energy?
Hydro energy
What's this SOURCE of energy?
Wind energy
What's this TYPE of energy?
Natural gas
What's this TYPE of energy?
Coal
What's this SOURCE of energy?
Tidal energy
What's this TYPE of energy?
Oil