Advertisement Upgrade to remove ads

Mechanical Weathering

The process that breaks rock into different shapes and smaller pieces. (physical appearance)

Temperature

Heating and cooling that cause rocks to expand and contract. Temperature changes cause outer layers of rock to crack.

Exfoliating

When the outer layers of rocks crack and break off

Frost Action

Liquid water seeps into cracks and expands when frozen, causing small cracks to widen and open up

ORganic Activity

Animals scratch and dig on the surface breaking rocks. Plant roots break up soil, even asphalt and concret

Gravity

Gravity can pull loosened rocks down hills or mountains in a landslide. When mixed with water it is a mudslide

Abrasion

Wind carrying particles smooth rocks on the surface. Water carrying particles smooth rocks in rivers and oceans

Chemical Weathering

The process that changes the mineral composition or chemical make up of the rocks

Water

Water can dissolve most types of minerals that hold rocks together. These rocks are said to be soluble which means able to dissolve

Oxidation

Oxygen chemically combines with other elements such as iron making iron oxide or rust

Carbonation

When carbon dioxide dissolves into water it is called carbonic acid. This can dissolve rocks but is too weak to harm people or plants. It can dissolve limestone and soft rocks.

Sulfuric Acid

Sulfur dioxide is a product of burning fossil fuels and it combines with water to form acid rain, which affects marble statues, paint, and metal

Plant Acids

Plants produce weak acids that break down rocks. Lichens or mosses break down rocks and can form soil.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set