Heat
by Alan Pillay

1. Sources of heat
1.1. Natural Sources
1.1.1. Hot geyser
1.1.2. Sun
1.1.3. Hot Spring
1.2. Unnatural Sources
1.2.1. Candle Flame
1.2.2. Burning Coal
1.2.3. Matches
1.2.4. Burning Wood
1.2.5. Electric oven
1.1.1. Hot geyser
1.1.2. Sun
1.1.3. Hot Spring
1.2.1. Candle Flame
1.2.2. Burning Coal
1.2.3. Matches
1.2.4. Burning Wood
1.2.5. Electric oven