Freida is modeling the change of state known as melting. When she knocks down the pyramid of marshmallows and they fall, it represents the transition from a solid state (where atoms are closely packed together) to a liquid state (where atoms are more loosely arranged and can move freely). This is similar to how solid ice (a solid state) melts into water (a liquid state) when heat is applied.
Freida wants to model the way atoms move when a substance changes its state. To do this, Freida makes a pyramid of marshmallows. Then, she knocked down the pyramid causing the marshmallows to fall. If the marshmallows represent the atoms in the substance, which change of state is Freida modeling? melting freezing condensation deposition
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