Weathering of Rock

1
Weathering of Rock
Bryce National Park, UT
2
Two Types of Weathering

• Chemical weathering
• Transform rock into new substances
• Physical weathering
• Breaking down and reshaping rocks.

Pair share A tell B what type of rocks these
are.
3
Chemical Cave formations carbonic acid

• CO2 H2O carbonic acid
• dissolves rock underground
• forming caves

4
Chemical Oxidation
Pair share B tell A what kind of metal is in
these rocks to turn them this color.

• Water reacts with minerals in rock
• Water also carries O2, forming oxides

Monument Valley, UT
5
Chemical Acid rain
Whiteboard What is pH?

• Normal rain is pH 5.7
• Pollutants from fossil fuels lower the pH to 4-5
• Damages living things, stone, and metals

1908
1969
6
Physical weathering

• Physical processes shape and move rocks

Pair share A explain how water or a tree can
break a rock?
7
Erosion

• The removal and transport of materials by water,
  wind, waves, ice, gravity

Pair share B explain to A what shaped the rock
above and what is happen in the picture to the
right.
8
Glaciers
Half Dome,Yosemite

• Rivers of ice rock Cut U shaped valleys

9
Wind erosion
Arches National Park, UT

• Dust carried by wind acts like a sandblaster
• Smoothes and shapes rock

10
White board Review

1. What are the two types of weathering?
2. What makes rocks like this one red?
3. What shaped this rock?

11
Summary

• Main idea
• Key concepts
• Important facts
• How the facts relate to the main idea