Sticky Science Lab Report Sticky Science Lab Report
Magma Mechanics: Viscosity & Silica Analysis
Vulcanology Field Unit
Student Name
Date
The Mystery of Magma
Why do some volcanoes produce gentle rivers of fire while others explode with the force of nuclear weapons? The answer lies in the molecular geometry of silica. In this lab, we will model "silica content" using common fluids to observe how resistance to flow determines volcanic morphology.
I. Pre-Lab Hypothesis
Compare Honey (High Silica Model) and Water (Low Silica Model). Which will flow down the incline faster? Why?
II. The Viscosity Race
Materials
Inclined plane (30° angle)
Stopwatch
3 Fluids: Water, Vegetable Oil, Honey
10ml Graduated Cylinders
Procedure
Mark a 20cm course on the incline.
Pour 5ml of the first fluid at the top.
Time how long it takes to reach the finish.
Repeat for all fluids (3 trials each).
Fluid Type Trial 1 (s) Trial 2 (s) Trial 3 (s) Average (s) Water (Low Visc) Oil (Med Visc) Honey (High Visc)
III. Analysis of Flow
1. Correlation: How does the "Silica Content" (modelled by viscosity) affect the speed of flow?
2. Slope Morphology: If you poured these liquids in one spot repeatedly, which would form a wide, flat mound? Which would form a tall, steep pile?
Sketch Flat Mound Here
Fluid: ____________________
Sketch Steep Pile Here
Fluid: ____________________
IV. Geochemical Connection
Teacher's Note: Magma is composed of silicon-oxygen tetrahedra (\(SiO_2\)). These molecules link together to form long chains or polymers. The more silica present, the more "tangled" these chains become, increasing the internal friction (viscosity).
3. Mafic Magma (Low Silica, ~50%) is like the water in our lab. What type of volcano would this create: a Shield volcano or a Stratovolcano? Explain your reasoning.
4. Felsic Magma (High Silica, ~70%) is like the honey. Why does high viscosity often lead to more explosive eruptions? (Hint: Think about trapped gas bubbles trying to escape).
Unit: Molten Earth Dynamics Lab ID: L1-VISC-001 Page 2 of 2
Magma Mechanics Slides Magma Mechanics
The Science of Viscosity & Silica
Why does the Earth's "plumbing" produce such different results across the globe?
The Great Liquid Race
Imagine we have two bottles: one filled with water and one with cold honey .
If we flip them over at the same time:
Which hits the floor first?
Which forms a "puddle" and which forms a "mound"?
A
Low Viscosity
Flows easily (Water)
B
High Viscosity
Resists flow (Honey)
The Geochemical Culprit: Silica (\(SiO_2\))
Mafic Magma
• ~50% Silica content
• Low viscosity (runny)
• Low gas entrapment
Result: Gentle eruptions
Felsic Magma
• ~70% Silica content
• High viscosity (thick)
• High gas entrapment
Result: Explosive eruptions
Think of Silica like tangled spaghetti . The more chains there are, the harder it is for the "sauce" (magma) to flow.
Viscosity Dictates Shape
Shield Volcanoes
Runny lava travels far before cooling. Creates wide, gentle slopes (like Hawaii).
Stratovolcanoes
Thick lava piles up quickly near the vent. Creates steep, towering peaks (like Mt. Fuji).
Magma Mechanics Teacher Guide Magma Mechanics Teacher Guide
Lesson 1 of 5
Duration: 90 Minutes
Group Size: 3-4 Students
Focus: Geochemistry & Flow
Lesson Overview
This lesson establishes the fundamental chemical reason for volcanic diversity: **Silica polymerization**. Students will transition from a tactile laboratory experience (viscosity lab) to a conceptual understanding of how molecular structure dictates tectonic hazards.
1. The Hook: The Liquid Race (10 min)
Use Slide 2 to prompt a discussion. Ask students: "If you want to build a steep sandcastle, do you want wet sand or dry sand?" Connect this to how viscosity allows material to "stack" (high viscosity) vs. "spread" (low viscosity).
2. Lab: Sticky Science (40 min)
Technical Tips:
Temperature Matters: Keep honey in a warm water bath before the lab to ensure it flows, but keep the temperature consistent across all groups.Cleanliness: Use plastic sheets or trays on lab benches.Angles: Ensure all groups use the same incline angle (30°) for comparable data.
Key Concept: Silica (\(SiO_2\)) is the independent variable. Viscosity is the dependent variable.
3. Direct Instruction: Geochemical Chains (20 min)
Transition to Slides 3-4. Introduce the term Polymerization . Explain that silica tetrahedra share oxygen atoms to form chains.
Analogy: Low silica is like a bowl of marbles (they roll past each other). High silica is like a bowl of cooked spaghetti (they tangle and resist movement).
4. Synthesis: Morphological Match (20 min)
Students complete Section IV of the Lab Report. They must correlate:Mafic Magma → Low Silica → Low Viscosity → Shield Volcano (Effusive) Felsic Magma → High Silica → High Viscosity → Stratovolcano (Explosive)
Common Misconceptions
Students often think "viscosity" means "thickness" in terms of density. Clarify that it is resistance to flow .
They may think high-viscosity magma is "stronger." In reality, its internal friction is higher.
Clarify that temperature also affects viscosity (hotter = lower viscosity), though silica is the dominant chemical driver.
Extension Activity
The Gas Trap: Demonstrate the effect of gas entrapment by blowing bubbles through a straw into water vs. a milkshake. The milkshake (high viscosity) traps large bubbles that "burst" violently, simulating explosive felsic eruptions.
Eruption Profiles Slides Eruption Profiles
Classifying the Beasts of the Earth
Hawaiian
Strombolian
Plinian
Volcanic Explosivity Index (VEI)
VEI Classification Plume Height Eruption Style 0-1 Gentle / Effusive < 1 km Hawaiian 2-3 Explosive 1 - 15 km Strombolian / Vulcanian 5-8+ Cataclysmic > 25 km Plinian (Mt. St. Helens)
Note: Each step on the VEI scale represents a 10-fold increase in the volume of erupted material.
Effusive vs. Explosive: A Tale of Two Mountains
Kilauea, Hawaii
Eruption: Constant, low-energy lava flows.Danger: Property damage, but usually slow enough to outwalk.
TYPE: EFFUSIVE (VEI 0)
Mt. St. Helens, USA
Eruption: Massive lateral blast and vertical ash column.Danger: Instant destruction over miles.
TYPE: EXPLOSIVE (VEI 5)
Observation: Eruption Mechanics
Place YouTube URL here to compare eruption styles
Look for:
Viscosity of moving lava.
Look for:
Gas fragmentation and "fire fountaining."
Look for:
Plume height and ash distribution.
Volcano Profiles Worksheet Volcano Profiles
Tectonic Morphology Identification
Name: __________________________
Date: __________________________
I. Morphology Classification
Match the following descriptions to the correct volcano type. Write S for Shield, ST for Stratovolcano, and C for Cinder Cone.
Steep-walled vent, usually small, formed from the accumulation of ejected tephra (lava "crumbs").
Broad, slightly domed structure, built mainly of fluid basaltic lava flows.
Large, nearly symmetrical structure composed of interbedded lava flows and pyroclastic deposits.
Known for high-explosivity eruptions (Plinian style) due to high-silica magma.
II. Visual Profile Analysis
Profile A
Slope: 2 - 10 degrees
Volcano Type:
Lava Composition (Mafic or Felsic?):
Profile B
Slope: 30 - 35 degrees
Volcano Type:
Lava Composition (Mafic or Felsic?):
III. The VEI Connection
1. Why are shield volcanoes rarely classified higher than a VEI 1 or 2?
2. Mount Pinatubo (1991) produced a plume that reached 35km into the atmosphere. Using your VEI chart from class, what would be its likely VEI rank? What does this imply about the silica content of its magma?
Module: Volcanic Processes Material ID: VP-IDENT-02
Eruption Evidence Key Answer Key: Volcano Profiles
Teacher Resource
I. Morphology Classification
C
Steep-walled vent, usually small... (Cinder Cone)
S
Broad, slightly domed structure... (Shield Volcano)
ST
Large, nearly symmetrical structure... (Stratovolcano / Composite)
ST
Known for high-explosivity eruptions (Plinian)...
II. Visual Profile Analysis
Profile A (Shield)
Volcano Type: Shield Volcano
Composition: Mafic (Basaltic)
Example: Mauna Loa
Profile B (Stratovolcano)
Volcano Type: Stratovolcano / Composite
Composition: Felsic / Intermediate (Andesitic/Rhyolitic)
Example: Mount Rainier
III. Critical Reasoning
1. Why are shield volcanoes rarely high VEI?
Because their magma is low in silica (mafic). Low viscosity allows gases to escape easily through the liquid magma rather than building up pressure until an explosive burst occurs.
2. Mt. Pinatubo Plume Analysis
VEI Rank: 6 (Colossal).Implication: Very high silica content (felsic). The magma was extremely viscous, trapping massive amounts of volcanic gas that powered the enormous eruption plume.
Density Danger Slides Hazard Zone Dynamics
Pyroclastic Flows & Tephra Fallout
"The most dangerous currents on Earth are not found in the ocean, but on the slopes of volcanoes."
What is a Pyroclastic Flow?
A PDC is a high-speed avalanche of hot gas, ash, and rock fragments (tephra).
• Temp: Up to 1,000°C (1,830°F)
• Speed: Over 700 km/h (450 mph)
• Physics: Gravity-driven density current
Density + Gravity = Total Destruction
The Survival Math
Usain Bolt
44 km/h
World's fastest human
Sports Car
250 km/h
Highway speed
PDC
700 km/h
You Cannot Run
The only solution is Early Evacuation based on monitoring.
Tephra Fallout & Ash Plumes
Impact Factors
• Wind Direction: Carries ash hundreds of miles.
• Eruption Column: Height determines travel distance.
• Particle Size: Large rocks fall near vent; fine ash travels global.
Infrastructure Dangers
1 Aviation: Ash melts in jet engines, causing stalls.
2 Respiratory: Glass shards in ash damage lungs.
3 Roof Collapse: Wet ash is heavy as concrete.
Ash Fallout Mapping Activity Ash Fallout Mapping
Tectonic Hazard Modeling Lab
Section: 10th Earth Science
Scenario: Mount Cascade Eruption
Mount Cascade, a stratovolcano, has just entered a Plinian phase. The eruption column has reached 20km. Meteorologists report a prevailing wind from the West at 45 km/h. Your job is to map the tephra (ash) hazard zones for nearby settlements.
I. Hazard Map Synthesis
Mt. Cascade
Ashville
Port Dusty
Clearwater
PREVAILING WIND (WEST)
Sketch Isopach Map Here
Instructions: Draw elliptical isopach lines (thickness contours) extending downwind from the volcano.
II. Risk Assessment
1. Predict the relative ash thickness (cm) at Clearwater vs. Ashville. Explain why the wind direction is the primary driver of this difference.
2. Physics Connection: Why do large volcanic "bombs" (clasts >64mm) fall within 5km of the vent, while fine ash particles can stay airborne for days and travel global distances?
Hazard Speed Calculations Guide Hazard Speed Calculations Guide
Teacher Key & Instructional Background
KEY: LESSON 3
I. The Physics of Pyroclastic Flows
Pyroclastic Density Currents (PDCs) function as **fluidized gravity currents**. The high temperature (reducing friction) and the high density of ash particles relative to air create a "liquid-like" avalanche that ignores terrain, often traveling up and over hills.
Example Calculation: Warning Window
Problem
A town is 12 km from the base of a volcano. A PDC begins at the summit. If the flow speed is 400 km/h, how much time do the residents have?
Answer & Logic
Time = Distance / Speed1.8 Minutes (108 seconds)
Conclusion: Evacuation *during* an eruption is impossible. Preparation must happen days in advance.
II. Ash Fallout Mapping Key
Location Expected Risk Mitigation Strategy Clearwater Minimal (Upwind) Basic masks, clear road drains. Ashville Severe (>20cm) Full Evacuation. Port Dusty Moderate (5-10cm) N95 Masks, keep livestock indoors.
Teaching Tip: Remind students that ash is not like "snow." It is pulverized rock/glass. It does not melt. It becomes "volcanic cement" when wet, which is why it collapses roofs so effectively.
Warning Signs Slides Monitoring the Monster
Pre-Eruptive Warning Signals
Seismicity
Deformation
Gas Flux
Signal 1: The Swelling Mountain
Tiltmeters & GPS
As magma moves upward, it creates pressure that physically "bloats" the volcano like an inflating balloon.
What it tells us:
Magma depth and volume
Intrusive vs. Extrusive trends
Steep Increase = Rapid Inflation
Signal 2: Chemical Exhalation
Sulfur Dioxide (\(SO_2\))
High \(SO_2\) levels indicate that magma is close to the surface and degassing. A sudden drop in gas can actually be more dangerous—it means the system is "plugged" and pressure is building.
The "Breath" of the Volcano
Increasing \(CO_2\) / \(SO_2\) ratio
Rise in fumarole (vent) temperature
Change in groundwater acidity
Signal 3: Harmonic Tremor
Standard earthquakes (VT quakes) are sharp and short—caused by rocks breaking.
Harmonic Tremors are long, continuous vibrations caused by magma rushing through subterranean "pipes."
"It's the sound of the engine starting."
VT Quake (Shattering Rock)
Harmonic Tremor (Magma Movement)
Vulcanologist Data Packet Vulcanologist Data Packet
Observatory ID: MT-VULCAN-7
Alert Level: UNKNOWN
STATION: MT. SHADOW
Chief Investigator
Date/Time of Review
Data Stream 01: Seismicity
Earthquake Count (24hr)
142 +80%
Pre-magmatic fracturing trend detected.
Tremor Type
HARMONIC TREMOR DETECTED
Continuous 3.5 Hz signal originating 2km beneath the summit crater.
Data Stream 02: Deformation
Tiltmeter Tilt-Vector Analysis
The graph below shows the inflation of the North Flank over the last 14 days.
<table class="w-full text-xs"><tbody><tr class="border-b border-slate-100"><td class="py-2 font-bold">Net Inflation</td><td class="py-2 text-right">32.4 cm</td></tr><tr class="border-b border-slate-100"><td class="py-2 font-bold">Radial Change</td><td class="py-2 text-right">+4.2 mm/day</td></tr><tr><td class="py-3 font-bold text-red-600" colspan="2">WARNING: Threshold for structural failure of North Flank is approaching.</td></tr></tbody></table>
Data Stream 03: Gas Flux
SO2 FLUX
2,500 t/d
Extreme
CO2/SO2 RATIO
12.5
Magmatic
FUMAROLE TEMP
450°C
+150°C Change
Official Recommendation
Based on the convergence of the data above, what is the current Alert Level and what action must be taken for the town of Shadow-Vale (located 15km downslope)?
NORMAL
ADVISORY
WATCH
WARNING (EVAC)
Justify your decision using at least TWO pieces of data from the packet:
Evacuation Protocol Script Evacuation Protocol Script
Lesson 4 Facilitation
This simulation requires the teacher to act as the "Director of Emergency Management."
Phase 1: The Briefing (Minutes 0-10)
Teacher Script Prompt:
"Team, we've had reports of 'strange noises' coming from Mt. Shadow. The local tourism board is pressuring us NOT to issue an alert because it's the start of their peak season. However, our instruments are starting to speak. Open your Data Packets. You have 20 minutes to synthesize the signal and give me a recommendation. Go."
Phase 2: Decoding the Monster (Key Insights)
Signal Expected Student Response Harmonic Tremor Magma is physically moving through the conduits; this isn't just rock breaking. Inflation 32.4cm is a massive change. The mountain is physically bulging; structural failure (landslide) is likely. Gas (SO2) Extreme flux (2,500 t/d) means magma is very close to the surface and actively degassing.
CRISIS INJECT (Minute 25)
Read aloud once groups have finished their initial analysis:
"URGENT: Station Shadow reports a SUDDEN DROP in SO2 emissions. Gas levels just went to near-zero. Does this mean the danger is over, or has the vent become plugged? Re-evaluate your evacuation recommendation NOW. You have 2 minutes."
Teacher Background: A sudden drop in gas after a peak usually indicates a "plugged" system, which leads to massive pressure buildup and an explosive eruption.
Phase 3: Debrief Discussion
Economic Pressure: How did the "tourism board" influence your early thinking?False Alarms: If you evacuate and nothing happens, the town loses millions. Is that your fault?Uncertainty: Can science ever provide a 100% certain 'time of eruption'? Volcanic Winter Slides Volcanic Winter
Global Climatic Impacts
"How can a single mountain in the tropics plunge the whole world into a deep chill?"
The Sulfur Aerosol Shield
Large explosive eruptions inject **Sulfur Dioxide (\(SO_2\))** into the Stratosphere (high atmosphere).
The Chemical Chain Reaction:
1 \(SO_2\) reacts with water vapor.
2 Forms Sulfuric Acid (\(H_2SO_4\)) droplets.
3 Droplets reflect incoming solar radiation.
Albedo Increase
Energy reflected back to space
Result: Net Cooling of Earth's Surface
1816: The Year Without a Summer
The Catalyst
Mount Tambora (Indonesia) erupted in April 1815.
It was the largest eruption in recorded history (VEI 7), ejecting 160 cubic km of material.
The Global Fallout
Snow in June: Widespread frosts in New England and Europe during summer.Temperature Drop: Global temperatures fell by ~0.7°C (1.3°F).Famine: Total crop failures led to the worst famine of the 19th century.
Volcanism & Climate Feedback
Cooling (Short Term)
Aerosols block sunlight for 1-3 years. Rapid global cooling and disrupted weather patterns (monsoons).
Warming (Long Term)
Volcanoes also release \(CO_2\). Over millions of years, massive volcanic periods (like Flood Basalts) can cause significant global warming.
Discussion Question: Could we use "artificial volcanic eruptions" (stratospheric aerosol injection) to fight climate change today? What are the risks?
Climate Cooling Investigation Worksheet Climate Cooling Investigation
Atmospheric Geochemistry Case Study
Student Name: __________________________
Date: __________________________
I. The Sulfur Mechanism
Study the diagram provided in the slides. When \(SO_2\) is injected into the stratosphere, it transforms into sulfuric acid aerosols.
1. Explain the concept of "Albedo." How do volcanic aerosols change the Earth's albedo and what is the net effect on surface temperature?
2. Why must the eruption be powerful enough to reach the Stratosphere to have a global effect? (Hint: Think about where "weather" and rain occur in the atmosphere).
II. Case Study: Mount Tambora (1815-1816)
"In June, the snow fell a foot deep in New Hampshire. By July, the birds were frozen in the fields. The corn did not ripen. We lived on fish and hope." — 1816 Journal Entry
Data Table: Post-Tambora Anomalies
<table class="w-full text-xs border-collapse"><tbody><tr class="bg-slate-50"><td class="p-2 border font-bold">Region</td><td class="p-2 border font-bold">Temp Anomaly (°C)</td></tr><tr><td class="p-2 border">Eastern N. America</td><td class="p-2 border text-blue-600 font-bold">-1.5 to -3.0</td></tr><tr><td class="p-2 border">Western Europe</td><td class="p-2 border text-blue-600 font-bold">-1.0 to -2.0</td></tr></tbody></table>
3. Systems Thinking: Trace the chain of events from a volcanic eruption in Indonesia to a famine in Europe. Fill in the missing links:
Eruption → \(SO_2\) Aerosols → ? → ? → Famine
4. Critical Analysis: Mount Kilauea erupts almost constantly but does NOT cause global cooling. Mount Pinatubo (1991) erupted for only a few days and caused a 0.5°C drop. Why?
Module: Volcanic Processes Material ID: VP-CLIMATE-05
Atmospheric Aerosols Answer Key Atmospheric Aerosols Answer Key
Teacher Resource
I. The Sulfur Mechanism
1. Albedo Concept & Effect
Definition: Albedo is the measure of the reflectivity of a surface.Effect: Volcanic aerosols increase the Earth's albedo by reflecting sunlight back into space before it can reach the surface. This reduces the total solar energy absorbed, causing surface cooling .
2. Why the Stratosphere?
Aerosols in the lower atmosphere (Troposphere) are quickly "washed out" by rain within days. If they reach the Stratosphere , there is no rain to remove them, allowing them to spread globally and persist for 1-3 years.
II. Case Study Analysis
3. The Chain of Events (Tambora)
Eruption → \(SO_2\) Aerosols → Reduced Solar Radiation → Shortened Growing Season / Crop Failure → Famine
4. Kilauea vs. Pinatubo Analysis
Kilauea is an effusive (low VEI) volcano; its gas stays in the Troposphere. Pinatubo was an explosive (Plinian, VEI 6) eruption that injected 20 million tons of \(SO_2\) directly into the Stratosphere, creating a global sunshade.
Teacher's Note: Geoengineering
Students may ask if we could mimic volcanoes to stop global warming. This is a real area of study called "Solar Radiation Management." Highlight the risks: Disrupting monsoons (causing famine in other countries), ozone depletion, and the fact that it doesn't stop ocean acidification (caused by \(CO_2\)).
