Mechanical: Rock is broken into smaller pieces without the composition changing., moving water tumbles river rocks which later become smooth, Burrowing animals move rock underground and cause it to break, Gravity causes landslides, which cause rocks to tumble and break, Plants roots grow in rock cracks and wedge rock apart over time, Glaciers move across Earth and shape the landscape, Wind moves particles which scrape against rock and change its shape, A gravestone cracks due to freezing and thawing of the stone, Tree roots crack the foundation of a home, shells on the beach are broken into sand by water moving them, Chemical: Breakdown of rock caused by a chemical reaction creating a new substance., The statue of Liberty's original copper color has turned green., acid precipitation causes damage to buildings and changes the pH in lakes and streams, Rock is broken down as a result of a chemical reaction changing it into a new substance, rocks in Sedona, Arizona have turned red in color due to oxygen reacting with iron in the rock, moss grows on the surface of rocks producing pits in the rock as it releases substances from its roots, acid rain dissolves features on a statue, chemicals in water react with minerals in rock and dissolve them, carbonic acid reacts with limestone to form caves, iron products react with oxygen in water and cause oxidation,

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