Day 1: Weathering Stations
Ask students, “What happens to rain
water after it hits the ground? Does that rain water carry anything
with it once it hits the ground? What types of things might it take
with it?” List student responses on overhead presentation board
and discuss their comments while answering questions. Follow this
discussion by introducing types of weathering.
Have student take notes during the lecture
and come up with one question they want answered that was not covered
by you. Students may use a KWL chart (S-8-6_KWL Chart Example.pdf) or any appropriate note taking method
already established in the classroom.
Weathering Notes Example:
Weathering: The breaking down of
Earth's surface.
Types of Weathering:
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Mechanical: Mechanical weathering is the process of
breaking Earth’s surface into smaller pieces.
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Block disintegration: Block disintegration involves
sharp temperature changes, making desert rocks expand and contract.
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Crystallization of salts: Crystallization of salts as
a result of dissolved salts expanding as they dry split the rocks
and honeycomb its surface.
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Exfoliation: Exfoliation is the flaking of intensely
heated surface rock as it expands more than the cooler rock below.
Rounded, isolated rock masses called exfoliation domes
result.
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Frost action: Frost action causes water to freeze and
expand in winter or at night, thus widening crevices. Piles of
sharp-edged debris, known as talus, form below steep peaks.
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Pressure release: Pressure release follows the removal
of overlying rock and its pressure on the rock below. Expansion of
that rock then forms curved joints, creating sheeting of rock shells
from the inner mass.
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Slaking: Slaking is the crumbling of clay-rich
sedimentary rocks as they dry out during drought.
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Tree roots: Tree roots widen cracks in rocks as they
grow.
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Chemical: Chemical weathering causes
the breakdown of rock, often transforming them when water interacts
with minerals to create various chemical reactions.
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Carbonization: Carbonization is the dissolving of limy
rocks by percolating rainwater which contains carbon dioxide from
the atmosphere or the soil.
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Hydration: Hydration is the taking up of water
and expanding by some minerals. This breaks shells from the rock
containing them.
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Hydrolysis: Hydrolysis is the water-rock
reaction whereby feldspar is turned into clay, decomposing granite
to produce kaolin.
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Organic weathering: Organic weathering involves
organic acids produced by plant organisms. The acids attack
rock-forming minerals.
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Oxidation: Oxidation is the process whereby
oxygen combines with compounds in some rocks. Oxidized iron forms
rust.
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Solution: Solution is the process whereby water
dissolves rock salt.
Address student questions from the lecture
and pose one of your own. “What are the differences between the
different types of weathering?” Show students weathering
pictures (S-8-6-3_Weathering Pictures.doc).
Also showing pictures of each process and effect is helpful.
Displaying pictures on the board will help to introduce weathering,
as will using Web sites, such as the following:
http://www.geography4kids.com/files/land_weathering.html
Address student questions as they point out
differences between the mechanical and chemical weathering pictures.
Weathering Labs
Prior to the lab, set up the room into seven
stations with all the necessary materials at each. Refer to the
student lab sheets for station materials (S-8-6-3_Weathering Labs-Station 1.doc,
S-8-6-3_Weathering Labs-Station 2.doc,
S-8-6-3_Weathering Labs-Station 3.doc,
S-8-6-3_Weathering Labs-Station 4.doc, S-8-6-3_Weathering Labs-Station 5.doc,
S-8-6-3_Weathering Labs-Station 6.doc, and S-8-6-3_Weathering Labs-Station 7.doc).
Organize students into groups of three to
five, depending on class size, and have them get started at different
stations. Students will complete each lab, moving up in lab station
number after each period is finished until they have completed all
seven labs. Lab sheets and necessary materials for each station are
found in the resource folder.
Below is an overview of the lab stations.
Specific directions are found on the individual lab sheets
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Station 1. Test rock samples (limestone, granite,
shale, sandstone, and anthracite coal) in carbonated water vs. tap
water. Observations are taken initially, at 20 minutes, and after 24
hours.
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Station 2. Test to show that water expands as it
freezes. Mark on a cup the water level before freezing and after
freezing.
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Station 3. Test the effects of vinegar (acid rain) on
copper (pennies). Here you should record observations initially and
then after 5 minutes.
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Station 4. Compare and record the reaction of antacid
tablets in water. The comparison is a whole tablet vs. a crushed
tablet.
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Station 5. Compare and record the reactions of chalk
(limestone) in water and vinegar.
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Station 6. Test and record the effect of water on
steel wool.
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Station 7. Test and record the effects of sugar cubes
and gravel shaken together in a jar.
As a conclusion to this part of the
lesson, ask students the following questions for a class discussion
on weathering:
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“How do weathering and erosion occur?”
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“What is the result of each type of weathering?”
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“Where on Earth, or where in Pennsylvania, does this
happen?”
Have students compare and contrast lab
results and discuss the similarities and differences they found. Lead
students to talk about human error and how that could factor into the
experiment.
Day 2: Erosion Labs
“Today we are going to talk about
erosion and how it affects our world.”
Have student take notes during the lecture
and come up with one question they want answered that was not covered
by you. Students may use a KWL chart (S-8-6_KWL Chart Example.pdf) or any appropriate note taking method already
established in the classroom.
Erosion Notes Example: Agents of Erosion
Erosion: The process by which
material from the Earth's surface is moved.
Types of Erosion:
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Water Erosion: Erosion occurring from the force of the
flow of water.
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Glacier Erosion: The movement of material and
sediments via transportation by glacier
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Wind Erosion: The result of material on Earth’s
surface moved by wind.
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Sea Erosion: Process where rock starts to weaken and
create a dent in the rocks by oceans and waves crashing on them.
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Soil Erosion: Process by which soil particles are
detached and transported via natural processes.
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Gravity: The constant pull of gravity makes all hill
slopes and mountain faces susceptible to landslides,
Discuss the differences between erosion and
weathering. Display erosion pictures for students to use as they
compare and contrast the various types (S-8-6-3_Erosion Pictures.doc).
Use the Erosion lab sheets and required
materials to set up each station (S-8-6-3_Erosion Lab-Station 1.doc,
S-8-6-3_Erosion Lab-Station 2.doc, S-8-6-3_Erosion Lab-Station 3.doc,
S-8-6-3_Erosion Lab-Station 4.doc, and S-8-6-3_Erosion Lab-Station 5.doc). Below is an overview of the lab stations.
Specific directions are found on the individual lab sheets.
-
Station 1: Demonstrates beach erosion. Using a pan,
make a sand pile at one end and pour water at the other end. Slide
the pan back and forth to create wave movement. Record observations.
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Station 2: Place an ice cube in a plastic cup of warm
water. See what the effect is. Record observations.
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Station 3: Freeze ice cubes with sand in them and then
move the sand ice cubes over different surfaces: sand, water, dirt,
etc. Record observations.
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Station 4: Place sand in a small bowl and then use a
hair dryer to move the sand. Note if different speeds are possible.
Record observations.
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Station 5: Place a pile of ice cubes on a mound of
dirt. Observe and record what happens as the ice cubes melt.
Ask the following discussion
questions:
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“How does erosion occur?”
-
“What is the result of each type of erosion?”
-
“Where on earth or where in Pennsylvania does this
happen?”
Students will compare and contrast lab
results and discuss the similarities and differences they found.
Students will also talk about human error and how that could factor
in to the experiment.
- Extension:
-
For students who need opportunities for additional learning:
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Give students lab sheets with room on the sides for
annotations. This gives students opportunities to record questions
they have along the way and for you to modify instructions and
content to meet individual needs at the lab station.
-
Have students draw pictures instead of writing lab results.
They can draw the process of what happens in the experiment.
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Students who are going beyond the standards can create a
science fair exhibit demonstrating some of the elements of the
lesson. Each exhibit should include the following:
- Posterboard visual or a PowerPoint-type presentation.
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Five-paragraph essay highlighting the key components of the weather
and erosion processes in the labs.