Weathering is the chemical or physical change of rocks.
Physical changes can happen when water gets into rock cracks, then freezes and expands to make the cracks bigger. Wind can wear away rock and make holes. This picture shows a rock worn away by wind. Gravity can also contribute to weat
hering by causing landslides.Chemical changes transform rock without actually breaking the rock. A metaphor for this would be charcoal turning gray as it burns. A chemical change that you might know is oxidation, also known as rust. Oxidation happens when oxygen is combined with another subs
tance, usually metal, and the metal turns brown and gets weaker.Another chemical change is acid rain, which forms when sulfuric and carbonic acid c
ombine and make rainwater more acidic. Carbonic acid can also get into rock and form caves.
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