Earthquakes: When the Ground Shakes

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

clay
water
plastic tray
magnifying glass
newspaper

Safety First

Do not taste any materials.
Wear safety goggles when mixing liquids.
Wash hands after handling materials.

Steps

Step 1 — Read

Read about Earth Systems 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?