Weathering By: Katherine Pease 7 th Grade Plummer Middle School

What is Weathering?  Weathering ______________________ ______________________ ______________________ _____________________. A wooden post that soaked for many years in a pool of brine in Owens Lake (dry), eastern California. The grotesque swelling of the wood results from deposition of salts in the wood.

What are the two main types of weathering?  _________ Weathering

Mechanical Weathering, what is that?  It is the process of _________________________ _________________________ _________________________ ________________

What causes this mechanical weathering to happen?  Abrasion  Plants  Animals  Wedging  Water  Wind  Ice

What is Abrasion?  Abrasion refers to the ___________________ ___________________ ___________________ ___________________ __________________

How do plants and animals cause mechanical weathering?  Roots and plants ________________________ _____. They act like ______ and push the rocks apart.  Little animals also help by ________ and ________ through the ground.

How does wind cause mechanical weathering?  Some rocks that are composed of soft minerals or are composed of particles that are not well cemented may __________________ when struck by ______________ or ________________________ __.

What is Frost Wedging?  FROST WEDGING. There are already some small cracks in boulders, ______gets in the cracks, when that water ______ the rock is _______instead of __________________.

 The pictures in this article are from the summit ridge of Ypsilon Mountain, perhaps one of the best spots in the park to see the effects of frost wedging. You can clearly see in these pictures how the rocks were split apart into plates -- a sure sign of frost wedging at work.

What is Salt Wedging?  SALT WEDGING. When it ____ and __________________, it usually have ions and salts dissolved inside. The _____________________ and ______________. Slowly _____________________, those crystals act like a _________ and _______________________

A wooden post that soaked for many years in a pool of brine in Owens Lake (dry), eastern California. The grotesque swelling of the wood results from deposition of salts in the wood.

Ok, but what is Chemical Weathering then?  ___________ ___________ ___________ ___________ ___________ ___________ ______

But how does this chemical weathering make the changes?  Through the process of… __________________  ___________  ________________

What do you mean by oxidation ?  The process by which _________________________________ _________________________________ ________________________________  When iron reacts with oxygen, reddish -brown iron oxide is formed. The iron-oxide crust crumbles easily and weakens the rock.

Oxidation Continued  ______________________ ______________________

Then what is hydrolysis?  HYDROLYSIS is…  _____________________________ _____________________________ _____________________________ _____________________________  For example, during hydrolysis, the feldspar in granite changes to clay mineral which crumbles easily, weakening the rock and causing it to break down.

What is carbonization?  ____________________________ ____________________________ ____________________________ ____________________________  This process weakens the rock thus ____________________________ ____________________________ ____________________________