Earthquakes: When the Ground Shakes (Part 3)

What You'll Learn

Earthquakes happen when stress builds up along faults in Earth's crust and suddenly releases. Seismic waves radiate from the focus, shaking the ground.

Key Words

erosion
sediment
igneous

Materials Needed

cotton balls
food coloring
clear container
rocks
sand
clay

Safety First

Wear safety goggles when mixing liquids.
Wash hands after handling materials.
Be careful with scissors — ask an adult for help if needed.

Steps

Step 1 — Read

Read about Weathering and Erosion and write down three key facts.

Step 2 — Do

Test rock hardness using Mohs scale: try scratching rocks with your fingernail, a penny, and a nail. Rank them from softest to hardest.

Step 3 — Observe

Look for patterns in your observations.

Step 4 — Record

Make a graph or chart showing your results.

Check Your Understanding

Question 1

1 of 3

What is an aquifer?