By:Jenna Theron

Breaking down rocks by PHYSICAL means.

Rocks weather by peeling off sheets.

Thawing and freezing of water in cracks to break rocks apart.

Is the scraping of a rock by friction between particles during there transportation by water.

Scraping of rock surface by friction between rocks and moves particles by wind.

Scraping of rock surface by friction between rocks and moves particles by gravity.

 A plant that grows then the force of its expanding roots become strong then the cracks widen.

Animals dig tunnels,or burrow under ground to cause particles to move which causes weathering.

Breaking down rock by CHEMICAL REACTIONS.

Rain containing relatively high concentrations of acid-forming chemicals.

 Groundwater comes intact with certain rocks a chemical reaction starts.

Oxygen from the air reacts with iron in rocks.