1. Flower structure and reproduction: stigma, anther, pollination, fertilisation, insect attraction, life cycle sequence
2. Water properties: boiling/freezing point, expansion on freezing, gas particle arrangement, vapor state, solubility
3. Forces and motion: gravity, friction, applied force, air/water resistance, magnetism, satellite orbit
4. Sound investigation: surface impact on loudness, sound made by vibration, volume vs. pitch
5. Seed germination: effect of light and temperature, dependent variables, fair testing, germination conditions
6. Pollution and environment: ocean pollution sources (sewage, farming, air, boats), environmental harm, water cycle