Transcript Physical and Chemical Weathering

Physical and Chemical
Weathering
Eric Angat
Teacher
1.What are the two types of weathering?
2.What are the different types of physical
weathering?
3.How is root wedging similar with frost
wedging?
4.Why are rivers rocks rounded and smooth?
Think!
5.What is differential weathering?
6.What is the relationship between climate and
weathering
7.What is the relationship between surface area
and weathering?
Physical or Mechanical weathering
https://www.youtube.com/watch?v=u_WN2ICRb2M
Types of Physical or
Mechanical Weathering
1.Frost wedging
2.Root wedging
3.Abrasion
4.Exfoliation
5.Differential weathering
Frost wedging
Icea wedging, also called freeze-thaw, happens when water, such as rain,
goes into cracks of rocks. And when the water freezes, its force increases so
that it expands the cracks which eventually lead rocks to break down into
pieces.
Physical or Mechanical weathering
Unloading
Root
wedging
https://www.youtube.com/watch?v=u_WN2ICRb2M
Frost
wedging
Temperature
changes
This is an example
of
root wedging
Roots produce carbonic acid
that dissolves minerals in
rocks. ( chemical )
Roots grow through
cracks in rocks. (
physical)
This is an
example of of
tumbling and
abrasion
Abrasion happens when rocks rub
together resulting to smoother rocks.
Tumbling happens when rocks roll on the
surface hitting other rocks resulting to
rounded rocks.
Rock hardness
Rate of
weathering
Surface area
Rate of
weathering
Surface Area
Cold and dry
climate
Rate of
weathering
Warm and
humid climate
Rate of
weathering
Warm and humid
This is an
example of
differential
weathering.
Minerals in the
middle of the
rock is more
prone to
weathering.
Differential weathering
Exfoliation
xfoliation is one type of
mechanical weathering. It is
created when underneath
rocks that are pressed by
other rocks are exposed to
less pressure. When they
become free from pressure,
they expand and they are
peeled off. This often
creates domes and hills.
1.What are the two types of weathering?
2.What are the different types of physical
weathering?
3.How is root wedging similar with frost
wedging?
4.Why are river rocks rounded and smooth?
Think!
5.What is differential weathering?
6.What is the relationship between climate and
weathering
7.What is the relationship between surface area
and weathering?
Chemical Weathering
https://www.youtube.com/watch?v=P8oWj3PVK9E
Types of Chemical Weathering
1.Hydrolysis
2.Oxidation
3.Carbonation
4.Lichens
5.Acid precipitation
Chemical weathering
https://www.youtube.com/watch?v=P8oWj3PVK9E
8. What are the different types
of chemical weathering?
9. How is chemical weathering
different from physical
weathering?
10 . How is weathering different
from erosion?
8. What are the different types
of chemical weathering?
1.Hydrolysis
2.Oxidation
3.Carbonation
4.Lichens
5.Acid precipitation
9. How is chemical weathering
different from physical
weathering?
• Physical weathering involves
breaking of rocks without altering
their chemical properties.
• Chemical weathering involves
breaking of rocks and changing
chemical properties.
10 . How is weathering different
from erosion?
Weathering is the
breaking of rocks while
erosion is the transport
of rocks.