* Physical Change: A physical change alters the form or appearance of a substance but doesn't change its chemical composition.
* Magma to Rock: When magma cools, the chemical composition of the molten rock remains the same. The change is in its physical state, from liquid to solid.
Examples of Physical Changes:
* Melting ice (water to ice)
* Boiling water (liquid to gas)
* Cutting paper
* Dissolving sugar in water
Chemical Changes:
* Burning wood (producing ash and gases)
* Rusting metal (formation of iron oxide)
* Cooking an egg (protein structure changes)