does metal rust - yes metal does rust, a sponge - this object is absorbent, metal - iron, what happens when a cake is baked does it rise or fall - it rises, seiving - reversible, fire triangle - heat oxygen and fuel, flammable - plastic, crafting - irreversible, conductor of electricity - water, tree needs ...... - ........ CO2, how to make your heart go faster - running, what is a conductor - one is wood,

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