Physical Weathering Mechanical/ physical weathering: The physical breaking up of rock but does not change composition.

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Presentation transcript:

Physical Weathering Mechanical/ physical weathering: The physical breaking up of rock but does not change composition.

Chemical Weathering Chemical Weathering: The change of the chemical composition of minerals or rocks due to chemical reactions.

Physical vs Chemical Weathering Mechanical/ physical weathering, the physical breaking up of rock changing the shape and size of the rock. Freezing temperatures: Frost/ ice wedging Water expands by 9% when it freezes Particles in wind or water: Abrasion These particles wear a rock down over millions of years Plant roots: roots move rocks Pressure from the roots breaks rock apart

Physical vs Chemical Weathering Chemical Weathering: The breakdown and change of the chemical composition of rocks and minerals. It creates new substances. This usually results in a change of color. Acid precipitation: Hydrolysis Causes rocks like marble or limestone that contains calcite to dissolve in acidic water Reaction with oxygen: Oxidation Forms rust or tarnish

Physical vs Chemical Weathering Occurs strongest in cold areas with a lot of ice and wind Chemical Occurs strongest in warm climates with a lot of water (rain) to assist in the chemical reactions.

What type of weathering is being shown? For the following slides identify if there is mechanical or chemical and name the type of each

Roots push sidewalk up

Over time the low PH of rain in a certain area broke down the rock on this statue

Water freezes, expands and causes rocks to cracks

The wind caused rocks to hit other rocks and break one another apart

Iron minerals react with the air and turn red as a result of the reaction

Water reacts with minerals in limestone caves and forms stalactites and saltagmites