Topic Physical and Chemical Weathering. Weathering vs. Erosion Weathering--Erosion--
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Transcript of Topic Physical and Chemical Weathering. Weathering vs. Erosion Weathering--Erosion--
TopicTopic
Physical and Chemical Physical and Chemical WeatheringWeathering
Weathering vs. ErosionWeathering vs. Erosion
WeatheringWeathering
----
ErosionErosion
----
Physical (Mechanical) Weathering
----
1) Frost Action1) Frost Action
•----•----
Temperature drops below
freezing
Expanding ice causes crack to become larger
Frost ActionFrost Action
Frost Action Causes Roadway Frost Action Causes Roadway PotholesPotholes
No, it’s the L.I.E.
Potholes Potholes & &
Frost Frost HeavesHeaves
2) Organic Activity: --
Plant roots create a Plant roots create a channel for air and water channel for air and water to go into the rockto go into the rock
Niagara Glen, Niagara-on-the-Lake, Ontario, Canada
Root Action
Burns 2007
3) Exfoliation: ----
Exfoliation caused by:Exfoliation caused by:
Thermal expansionThermal expansion – ----– Very common in arid Very common in arid
areas like Southwest areas like Southwest U.S.U.S.
Geology 211, Physical Geology, ©, 2002, Ron Parker
Thermal ExpansionThermal Expansion
Physical changes in sediments -
Abrasion:
----
Formed by water abrasion
Formed by wind abrasion
Final Question:Name a location on Earth that has a considerable amount of frost action.
Topic: Chemical Weathering
Chemical WeatheringChemical Weathering--
**--** **--**
Solution - --Ex) Salt dissolving in water
Soluble – --Ex) Salt is soluble in water
Powerful Solutions:Powerful Solutions:
Acid RainH2O (rain) + CO2 (carbon dioxide) = H2CO3 (carbonic acid)
Result: *-- *--
The details of marble statues and The details of marble statues and tombstones will be gradually worn tombstones will be gradually worn away by dissolution. away by dissolution. Image courtesy of Dr. Annabelle Foos.Image courtesy of Dr. Annabelle Foos.
Karsts Topography
– forms caves,
caverns, and sinkholes
Stalagmites
Stalactites
The Witch's Finger, a stalagmite in the Carlsbad Caverns, NM
NPS photo by Peter Jones
Do you see Do you see the person the person
in this in this picture?picture?
Sinkhole FormationSinkhole Formation
Sinkhole—Winter Park, FLSinkhole—Winter Park, FL
Sinkhole at Winter Park, Florida (1981) that formed catastrophically in the time span of one day. The city of Winter Park stabilized and sealed the sinkhole, converting it into an urban lake.
2) Create Plant Acid2) Create Plant Acid
-- => ---- => --
----
Hydration
=>
•--
Oxidation –Oxidation –----
Ex) Iron + Oxygen = Iron Oxide (rust)Ex) Iron + Oxygen = Iron Oxide (rust)
Rust – Rust – Oxidation of IronOxidation of Iron
Oxidation Oxidation of Copperof Copper
FQ:
What rock dissolves to form stalactites in a cave?