Weathering

Think back… What do you remember about weathering and erosion? What did you do in 6th grade?

Weathering The process that breaks down rocks and other materials of Earth’s crust into smaller pieces.

Weathering can happen two different ways - Physical and Chemical

Physical Weathering Rock is physically broken down into smaller pieces, it is still rock

There are five types of physical weathering

Write the type of weathering here (it will be numbered in the slides) How to fill in notes Write the type of weathering here (it will be numbered in the slides) After viewing the sample slides, you will create your own picture (label it if necessary

1. Freezing and thawing

Frozen soda cans

Frost Wedging

Frost Heaving https://www.youtube.com/watch?v=_XnCTcjNpuc

Draw it Create a model (drawing) of how freezing and thawing can physically break rocks into smaller pieces.

2. Plant Growth

https://www.youtube.com/watch?v=eDA8rmUP5ZM

This is how paper beats rock!

Draw it Create a model (drawing) of how plant growth can physically break rocks into smaller pieces.

3. Animal Actions https://www.youtube.com/watch?v=TtUz514rXKo

Burrowing of Animals

Draw it Create a model (drawing) of how animal actions can physically break rocks into smaller pieces.

4. Friction and impact River rocks are rounded and smoothed due to the repeated tumbling along the river bed as they roll downstream

Evidence of past liquid water on Mars!

Draw it Create a model (drawing) of how friction and impact can physically break rocks into smaller pieces.

5. Temperature Changes Rocks expand (get bigger) when they are hot, and contract (get smaller) when they are cold.

This brick wall has expanded and there is a visible crack

Draw it Create a model (drawing) of how temperature change can physically break rocks into smaller pieces.

Chemical Weathering The process that breaks down rock through chemical changes. It is dissolved and is no longer rock.

https://www. youtube. com/watch https://www.youtube.com/watch?v=GNvnIl8hSUo chemical weathering examples

There are five types of chemical weathering

1. Water Water weathers rock by dissolving it, it is no longer pieces of rock.

Draw it Create a model (drawing) of how water can chemically dissolve rocks into smaller pieces.

2. Oxygen Iron combines with oxygen in the presence of water in a processes called oxidation The product of oxidation is rust

Draw it Create a model (drawing) of how oxygen can chemically dissolve rocks into smaller pieces.

3. Carbon Dioxide CO2 dissolves in rain water and creates carbonic acid Carbonic acid easily weathers limestone and marble https://www.youtube.com/watch?v=i8v3ty4g1vI carbon dioxide weathering and cycle

Draw it Create a model (drawing) of how carbon dioxide in water can chemically dissolve rocks into smaller pieces.

4. Living Organisms Lichens that grow on rocks produce weak acids that chemically weather rock

Draw it Create a model (drawing) of how living organisms can chemically dissolve rocks into smaller pieces.

5. Acid Rain Chemicals from burning coal, oil and gas react chemically with water forming acids. Acid rain causes very rapid chemical weathering

Draw it Create a model (drawing) of how acid rain can chemically dissolve rocks into smaller pieces.

All this weathering can create interesting landforms

Formation of Devil’s Tower, Wyoming http://www.youtube.com/watch?v=Hsh3_ZMKq-A

Karst Topography A type of landscape in rainy regions where there is limestone near the surface Created by chemical weathering of limestone

Features of Karst: Sinkholes

Guatemala City sinkhole, 2010 https://www.youtube.com/watch?v=a7cOSzEKvrQ underwater sinkhole https://www.youtube.com/watch?v=ZmzTccYQGbw Corvette Museum sinkhole http://abcnews.go.com/US/sinkhole-rent-best-deal-san-francisco/story?id=27363928 Sinkhole for rent

Features of Karst: Caves

Features of Karst: Disappearing Streams

Summary: What does weathering have to do with the rock cycle?

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