* Physical Changes: Involve a change in the form or appearance of a substance, but not its chemical composition.

* Examples: Melting ice, boiling water, cutting paper.

* Chemical Changes: Involve the formation of new substances with different chemical properties.

* Examples: Burning wood, rusting metal, baking a cake.

When a car drives over a puddle, the following happens:

1. Water displacement: The car pushes the water out of the way.

2. Splashing: The water moves and forms droplets.

3. Possible tire spray: Water may be flung from the tires.

These are all physical changes. The water remains water, just in a different location or form. No new substances are created.