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

barometer
anemometer
rock cycle

Steps

Step 1 — Read

Read about Plate Tectonics 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?