WATER
Libin Wanにより
1. states of water
1.1. solid(ice)
1.2. liquid(water)
1.3. gas(steam)
2. uses of water
2.1. drinking
2.2. cleaning
2.3. cooking
2.4. watering
3. sources of water
3.1. rivers
3.2. lakes
3.3. oceans
3.4. rain
4. water cycle
4.1. evaporation
4.2. condensation
4.3. precipitation
4.4. collection
5. properties of water
5.1. wet
5.2. clear
5.3. no taste
5.4. no smell