4th Grade Science: Chapter 5

What is an eruption?

• The release of material from a fault
• The release of material from a tsunami
• The release of material from a volcano

What is a volcano?

• An opening in Earth's crust that allows water to reach the surface
• An opening in Earth's crust that allows superheated rock and other materials below the crust to reach the surface
• An opening in Earth's crust that allows air to escape

What causes an earthquake?

• A sudden release of pressure on Earth's core
• A shift that releases pressure on Earth's crust and causes the crust to shake
• A sudden release of pressure on Earth's atmosphere

What is a tsunami?

• A massive storm with strong winds
• A massive wave created by volcanic eruption
• A massive wave created by an earthquake

What is a fault?

• An area in Earth's crust where water collects
• An area in Earth's crust where tectonic plates meet
• An area in Earth's crust where magma is stored

How do the plates move to cause stress along the faults?

• Slowly and continuously
• Rapidly and intermittently
• Erratically and unpredictably

What type of magnitude measurement causes greater hazards for people nearby?

• Low
• High
• Both

Anything less than a 6.0 is a serious earthquake.

• True
• False

Answer explanation

Anything greater than a 6.0 is a serious earthquake.

When the waves reach the coast, how do they move?

• Faster and lower
• Slower and lower
• Slower and higher

Hawaii's Kilauea has been erupting since 1983.

• True
• False