Science activity
Soil Scientists
Dig in the dirt! What can you find? Worms, roots, rocks, and more are hiding underground.
Materials and setup
- small shovel or stick
- cups or jars
- magnifying glass
- notebook
- pencil
- camera or phone
Parent note
Safety: check the digging spot first for broken glass, rusty metal, animal droppings, and nearby poison ivy/oak. Don't dig near roadsides (contaminated soil). Wear closed-toe shoes. Use gardening gloves if you have them, especially for older kids handling larger soil samples. Watch for biting/stinging insects (fire ants, yellow jackets, spiders — black widow has red hourglass, brown recluse is shiny brown). Wash hands thoroughly after digging — soil can contain tetanus bacteria, parasites, and animal waste. For the bake-soil-in-oven step (upper-elementary), parent handles the oven entirely; smoke alarm may trigger — ventilate. Apply sunscreen, bring water. Stay with your child in public parks. Reduced-mobility adaptation: parent can bring soil samples in cups or jars to a seated child for sedimentation tests, magnification, sifting, and texture analysis — all seated-accessible. The soil-food-web research, texture triangle classification, and agricultural assessment are desk-based.
How this changes by age
Pre-K (ages 3–4)
Dig in the dirt! What can you find? Worms, roots, rocks, and more are hiding underground.
Steps
Learning objectives
- Explore soil as a habitat for organisms
- Use tactile observation to describe soil properties
- Discover that living things exist underground
Kindergarten (ages 5–6)
Compare soils from 3 different spots. Find creatures living in each, test how water flows through them, and learn why worms are important.
Steps
Learning objectives
- Compare soil types using observable properties
- Understand that soil drains water at different rates
- Recognize earthworms' role in soil health
Early elementary (ages 6–8)
Investigate soil composition and biology. Test soil types, study decomposition, count organisms per sample, and understand soil layers.
Steps
Learning objectives
- Analyze soil composition using sedimentation jar tests
- Quantify soil biodiversity through organism counts
- Understand soil horizons and decomposition processes
Upper elementary (ages 8–10)
Conduct a soil science investigation. Analyze particle composition, test nutrients, study soil food webs, and assess soil health for agriculture.
Steps
Learning objectives
- Classify soil types using the soil texture triangle
- Measure organic matter content through loss-on-ignition
- Evaluate soil health for agricultural suitability
Safety and evidence note
Read the full activity before beginning. An adult should supervise tools, heat, food, outdoor work, movement, and experiments as appropriate. Completion records that the activity was done; the child’s explanation, work sample, photo, or demonstration is stronger evidence of learning than a completion check alone.
Related science activities
Animal Body Language & Behavior
Animals talk all the time — they just don't use words. A dog wags its tail high and loose when it is happy, but tucks its tail between its legs when it is scared. A cat holds its tail straight up like a pole to say hello, but puffs it up like a bottle brush when it is startled. A bird sings soft songs on a calm morning, but makes a sharp 'chip-chip-chip' alarm call when something dangerous is near. If you watch closely, you can understand exactly what they are feeling.
Animal Habitat Diorama
Choose a favorite animal and build its home in a shoebox! Use natural materials, paper, and toy animals to create a habitat scene.
Animal Habitats & Needs
Here is an animal that will surprise you: the mantis shrimp can punch with the force of a bullet. It sees 16 types of color — humans only see 3. And it lives in a burrow it digs itself at the bottom of the ocean. When scientists first discovered how powerful the mantis shrimp's punch was, it shattered the equipment they were using to measure it. Every animal's body is perfectly matched to the place it lives. Today you'll discover how that matching works.
Animal Tracks & Signs
Look for clues that animals have been nearby! Find footprints, nests, holes, or chewed leaves.