Understanding Earthquakes and Tsunamis

What is the primary cause of most earthquakes?

• Volcanic eruptions

• Tectonic plate movements

• Meteor impacts

• Human activities

How are tsunamis most commonly formed?

• By underwater volcanic eruptions

• By underwater earthquakes

• By strong winds

• By landslides into the ocean

Which scale is most commonly used to measure the magnitude of earthquakes?

• Richter scale

• Mercalli scale

• Beaufort scale

• Fujita scale

What is the focus of an earthquake?

• The point on the Earth's surface directly above the earthquake

• The point within the Earth where the earthquake starts

• The area affected by the earthquake

• The strongest point of the earthquake

What is the epicentre of an earthquake?

• The point on the Earth's surface directly above the earthquake's focus

• The point within the Earth where the earthquake starts

• The area affected by the earthquake

• The strongest point of the earthquake

Which of the following is a type of seismic wave?

• Sound wave

• Light wave

• P-wave

• Radio wave

What is the main impact of a tsunami on coastal areas?

• Increased rainfall

• Strong winds

• Large, destructive waves

• Earthquakes

What does the Richter scale measure?

• The intensity of an earthquake

• The magnitude of an earthquake

• The duration of an earthquake

• The depth of an earthquake

How do seismic waves help scientists?

• By predicting weather patterns

• By locating the epicentre of an earthquake

• By measuring ocean currents

• By determining the age of rocks

Which of the following best describes the Mercalli scale?

• It measures the magnitude of an earthquake

• It measures the intensity of an earthquake

• It measures the speed of seismic waves

• It measures the depth of an earthquake