Sand, Silt, and Clay Game & Soil Demonstration

🖥️ Walkthrough Slides (6) 📝 Take Quiz 🗂️ Vocabulary 📖 Curriculum Guide

Interactive Digital Curriculum

Interactive Walkthrough Slides

Step through the complete digitized curriculum deck with illustrated concepts, step-by-step procedures, teacher tips, and interactive knowledge checks.

Slide 1 Particle Scale Science

Soil Texture: The Three Mineral Fractions

Sand, Silt, and Clay Size Scale

Soil texture refers to the proportions of three different particle sizes: sand, silt, and clay.

To visualize their extreme size differences, imagine a grain of sand is as large as a basketball! A particle of silt would be the size of a baseball, and a clay particle would be smaller than a tiny marble.

🏀
Sand (Gritty): 0.05 to 2.0 millimeters. Visible to the naked eye.
⚾
Silt (Smooth / Silky): 0.002 to 0.05 millimeters. Feels like flour on skin.
🔮
Clay (Sticky / Microscopic): Less than 0.002 millimeters. Requires an electron microscope to see.

Slide 2 Active Simulation Game

The Human Particle Game Protocol

Simulating Water Flow and Pore Space Through Movement

Students act as mineral particles to experience how particle size dictates pore spaces:

Round 1 (Sand): Students spread out arms wide, standing 3 feet apart. A water droplet runner easily darts between them with zero resistance.

Round 2 (Silt): Students stand elbow-to-elbow. The water runner must weave slowly through narrower spaces.

Round 3 (Clay): Students lock arms tightly in a dense block. The water runner is blocked completely!

📋 Teacher Preparation & Field Guidance Notes ▾

Play this in the gym or outdoors. Discuss how pore size directly affects drainage after heavy rainfall.

Slide 3 Field Methodology

Laboratory Protocol: The Tactile Ribbon Test

Classifying Soil in the Palm of Your Hand

Soil scientists in the field use the Ribbon Test to estimate texture without laboratory sieves:

Step 1: Moisten a golf-ball-sized soil sample with water until it reaches putty consistency.

Step 2: Roll the sample into a cigar shape, then push it between thumb and forefinger to squeeze out a ribbon of uniform thickness.

Step 3: Measure the length of the ribbon before it breaks under its own weight!

🟡
No Ribbon (<0.5 inch): Coarse Sand or Sandy Loam; grains feel gritty.
🟢
Medium Ribbon (1–2 inches): Loam or Silt Loam; smooth, silky, moderate cohesion.
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Long Ribbon (>2 inches): Clay or Clay Loam; extremely sticky, forms long flexible ribbons.

Slide 4 Hydrology & Roots

Water Retention vs Drainage Dynamics

How Pore Space Dictates Plant Root Health

Sand has large pores (macropores) that let gravity pull water away in seconds. Roots stay well-aerated but can dry out quickly.

Clay has microscopic pores (micropores) with immense surface area. It holds water so tightly that plant roots can struggle to pull moisture free, and in wet weather, water saturates the soil and suffocates roots.

⚡ Quick Knowledge Pulse Choose 1 answer

Which soil texture holds the most water but provides the slowest drainage?

Slide 5 Agronomy Focus

Loam: The Agricultural Sweet Spot

The Perfect Balance for Tyonek Vegetables

Loam is an ideal agricultural soil consisting of roughly 40% sand, 40% silt, and 20% clay.

Sand provides drainage and aeration so roots can breathe; silt holds moderate water and nutrients; and clay provides cation exchange capacity to anchor minerals like potassium and calcium.

🌟
Best of All Worlds: Drains excess rain while staying moist and fertile.

Slide 6 Synthesis & Review

Soil Texture Application in Western Cook Inlet

Field Review & Student Presentation

Students record their ribbon lengths and particle feel in their science journals.

Teams recommend how to manage Tyonek garden plots based on whether they tested sandy outwash or silty river deposits.

📋 Teacher Preparation & Field Guidance Notes ▾

Conclude by asking: If your garden has heavy sand, what can you add to make it behave more like loam? (Compost and organic mulch!)

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Official curriculum guide preview for Sand, Silt, and Clay Game & Soil Demonstration

📄 2.-Sand-Silt-and-Clay-Game-and-Demonstration.docx-1-.pdf

Essential Inquiries & Learning Targets

Core Essential Questions:

How do the microscopic sizes of sand, silt, and clay particles determine how soil feels and behaves?
How does soil texture govern water infiltration, aeration, and root growth in Alaska?
What field tests allow farmers to determine soil texture without laboratory equipment?

Student Learning Objectives:

Compare particle sizes using the basketball (sand), baseball (silt), and marble (clay) analogy.
Participate in the Human Particle Game to simulate pore spaces and water percolation.
Perform the tactile Soil Ribbon Test to classify local soil into sand, loam, or clay.

Self-Grading Assessment

Comprehension Mastery Quiz

Test student understanding of scientific principles, local Alaska ecology, and problem-solving scenarios from the lesson guide. Earn the Sand, Silt, and Clay Game & Soil Demonstration Master credential!

Which soil mineral particle has the smallest individual diameter?

Terminology & Dena’ina Context

Specialized Vocabulary Flashcards

🗂️ Interactive Vocabulary Deck Card 1 of 4

Click the card or press Space to flip. Use arrow keys to navigate.

Term Click to flip ↷

Soil Texture

Definition & Context Click to flip ↶

The relative proportion of sand, silt, and clay mineral particles in a soil sample.

Alaska Context:

Soil Science

Educator Guide

Curriculum Standards & Activity Protocol

📚 Standards Alignment (NGSS & Alaska Cultural Standards)

5-PS1-3

Make observations and measurements to identify materials based on their properties.

NGSS

🏔️ Local Alaskan & Tebughna Context

Glacial rivers in the Cook Inlet basin carry massive loads of glacial flour (silt) that form wide mudflats and fertile valley bottoms.
Sandy coastal ridges around Tyonek drain water rapidly, requiring high organic matter additions to retain irrigation water.

📦 Required Materials & Classroom Setup

✓ Sand, silt, and clay reference samples✓ Local garden soil✓ Water squirt bottles✓ Rulers✓ Paper towels

🔬 Step-by-Step Hands-on Activity Guide

Step 1: Particle Game
Perform the Human Particle Game simulating sand, silt, and clay spacing.
Step 2: Feel Test
Rub dry and moist samples between fingers to feel grit vs smoothness.
Step 3: Ribbon Test
Form moist soil balls and squeeze out ribbons over a ruler.
Step 4: Texture Chart
Determine USDA soil texture class and log in science binder.

District Geographic Information System

2025 TTCD Annual Report

20 Years of Tribally Directed Conservation

Paid Summer Youth Internships