Weathering and Erosion
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Transcript Weathering and Erosion
Mrs. Fusaro
Fourth Grade Science
Mechanical Weathering
Mechanical
weathering is a
destructive force in
which larger rocks are
broken down into
smaller pieces of
rock, called
sediments.
Agents of mechanical
weathering include:
Ice
Water
Wind
Plant roots
Burrowing animals
Heating and
cooling
Chemical Weathering
Chemical weathering is a destructive force in
which rocks are changed into other materials as
they are broken down.
Water is the main factor that causes chemical
weathering. Water can dissolve some minerals
that make up rocks, which forms caves.
Moss and lichen growing on rocks are also
examples of chemical weathering.
Erosion
Erosion is the
destructive force in
which sediment is
moved by water,
wind, or moving ice.
A common agent of
erosion is water
moving down a
river.
Gravity can also
cause erosion.
Directions
In this activity, you
will be shown a
picture with a short
description. Then,
you will have to
decide if the picture
is an example of
mechanical
weathering,
chemical
weathering, or
erosion.
In this picture, water has seeped into cracks
in the rock, frozen, and expanded to break
the rock. This is an example of:
A Mechanical Weathering
B Chemical Weathering
C
Erosion
Correct!
This is mechanical weathering because the
rock does not change into a new substance,
and it is not being moved.
Move on to question 1!
Incorrect.
Try again.
Question 1
In this picture, the
flowing water is carrying
sediments down the
hillside. This is an
example of:
A
Mechanical
Weathering
B
Chemical Weathering
C
Erosion
Correct!
This is erosion because sediments are being
moved to a new place.
Move on to question 2!
Incorrect.
Try again.
Question 2
In this picture, the tree
roots are growing through
the rock, causing it to
break down into
sediments. This is an
example of:
A
Mechanical
Weathering
B
Chemical Weathering
C
Erosion
Correct!
This is mechanical weathering because the
rock does not change into a new substance,
and it is not being moved.
Move on to question 3!
Incorrect.
Try again.
Question 3
The cave in this picture is
formed when acidic water
seeps underground and
dissolves limestone and
other rocks below the
surface. This is an
example of:
A
Mechanical
Weathering
B
Chemical Weathering
C
Erosion
Correct!
This is chemical weathering because the
rock is changing into other materials.
Move on to question 4!
Incorrect.
Try again.
Question 4
As the glacier in this
picture moves across the
land it picks up sediments
and carries them as it
continues on its path.
This is an example of:
A
Mechanical
Weathering
B
Chemical Weathering
C
Erosion
Correct!
This is erosion because sediments are
being moved to a new place.
Move on to question 5!
Incorrect.
Try again.
Question 5
The moss and lichen in
this picture create an acid
which breaks down the
rock that they are growing
on. This is an example of:
A
Mechanical
Weathering
B
Chemical Weathering
C
Erosion
Correct!
This is chemical weathering because the
rock is changing into other materials.
Move on to question 6!
Incorrect.
Try again.
Question 6
The rocks in this picture
have been worn down over
time as wind has blown
sand against the rock,
causing parts of it to
become smooth while other
parts became jagged. This
is called abrasion. This is an
example of:
A
Mechanical
Weathering
B
Chemical Weathering
C
Erosion
Correct!
This is mechanical weathering because the
rock does not change into a new substance,
and it is not being moved.
Move on to question 7!
Incorrect.
Try again.
Question 7
In this picture the wind is
picking up sediments and
carrying them to a new
location. This is an
example of:
A
Mechanical
Weathering
B
Chemical Weathering
C
Erosion
Correct!
This is erosion because sediments are being
moved to a new place.
You have finished the game!
Click below to go to the resources
slide.
Incorrect.
Try again.
Resources
Information: Houghton Mifflin Science
Earth Science Unit C: Earth Systems 2009.
Photographs:
http://blog.travelpod.com/travel-photo/chipposgoglobal/1/1269720449/flowing-water.jpg/tpod.html
http://teach.albion.edu/jjn10/physical-weathering/
http://commons.wikimedia.org/wiki/File:Biological_weathering,_Harrison_Rocks_-_geograph.org.uk__71562.jpg
http://willapse.hubpages.com/hub/Chemical-Weathering
http://teachers.sduhsd.k12.ca.us/hherms/herms/GEOLOGY/weathering/weathering.htm
http://www.filmapia.com/published/places/glacier-bay-national-park
http://ecomerge.blogspot.com/2010/05/what-is-wind-erosion.html
http://www.ehow.com/facts_6173156_meaning-weathering_.html