It is a unique graphic story, in which Tintin teaches Snowy about matter and it's properties.
What is matter, energy
Physical and chemical properties of matter
Mass, weight, density, volume
Solid, liquid, gaseous states of matter
Element, compound and Mixture
Change of state of matter
Physical and chemical changes
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This unit with the "Game of Science, It's the battle for Matter" can be seen as the complete lesson on Matter.