Soil: What's Under Your Feet? (Part 2)

What You'll Learn

Soil forms slowly from weathered rock mixed with decomposed organic matter. Different layers (horizons) form with topsoil on top, subsoil below, and bedrock at the bottom.

Key Words

sedimentary
earthquake

Materials Needed

cotton balls
food coloring
clear container
rocks

Safety First

Use materials only as directed in the experiment.
Keep small objects away from young children.
Work in a well-ventilated area when using vinegar or other strong-smelling substances.

Steps

Step 1 — Read

Read and learn: Soil forms slowly from weathered rock mixed with decomposed organic matter. Different layers (horizons) form with topsoil on top, subsoil below, and bedrock at the bottom.

Step 2 — Do

Repeat the experiment two more times for accuracy.

Step 3 — Observe

Observe what happens and describe it in detail.

Step 4 — Record

Record your observations in your science journal.

Check Your Understanding

Question 1

1 of 3

What is a mineral?