List 4:
- Star
- Planet
- Moon
- Asteroid
- Comet
- Solar System
- Galaxy
- Universe
- Geocentric
- Heliocentric
List 3:
- Solution
- Solvent
- Solute
- Solubility
- Concentrated
- Dilute
- Heterogeneous
- Homogeneous
- Dissolve
- Saturated
List 2:
- Mass
- Volume
- Weight
- Density
- Buoyancy
- Gravity
- Physical property
- Chemical property
- Observation
- Measurement
List 1:
- Hypothesis
- Theory
- Law
- Experiment
- Independent Variable
- Dependent Variable
- Control Group
- Constants
- Reliability
- Reproducible