weathering andie
TRANSCRIPT
Many things cause this to happen. There are two types of weathering:
Mechanical (physical)Chemical
It is when rocks break down into smaller pieces because of some physical force. The rock does not change chemically, it just gets smaller! Sometimes called PHYSICAL weathering.
Photo by A. Criminger
Freezing and thawing is breaking these rocks apart!Ice Wedging
Photo by A. Criminger
Ice is breaking these rocks apart
Photo by A. Criminger
Roots are breaking these rocks apart.
ROOTPRY
Chemical weathering occurs when rocks are broken down by a chemical reaction. This can happen by water, oxygen, acid rain, and even living things.
http://web.mala.bc.ca
http://www.arts.tas.gov.au
http://www.geo.lsa.umich.edu
http://www.raisethehammer.org
On rocks
On man made objects
Photo by A. Criminger
Sometimes rocks are not the only things that get chemically weathered!
Copyright © Bruce Molnia, Terra Photographics
Carbon dioxide combines with water and forms a weak acid. This acid, over time can dissolve rock.
www.nullarbornet.com.au
Photo by A. Criminger
This rock is being broken down by the chemicals in the roots of the lichen growing on the rock.
http://www.geo.lsa.umich.edu
http://www.cartage.org.lb/
1. Type of material being weathered
2. Climate – warm climates weather material faster.