Layers of the Earth (Part 2)

What You'll Learn

Earth has three main layers: the thin outer crust, the thick mantle, and the dense core. The core has a liquid outer layer and a solid inner layer made mostly of iron.

Key Words

humidity
barometer

Materials Needed

thermometer
rain gauge
cotton balls
food coloring
clear container

Safety First

Do not look directly at the sun or bright lights.
Clean up spills immediately to prevent slipping.

Steps

Step 1 — Read

Review the background information on Earth's History before starting.

Step 2 — Do

Model erosion: tilt a tray of soil and pour water from a cup at the top. Observe how channels form. Try adding plants or rocks to slow the erosion.

Step 3 — Observe

Watch carefully for any changes and note the time.

Step 4 — Record

Create a data table to organize your measurements.

Check Your Understanding

Question 1

1 of 3

What causes earthquakes?