Earthquake Interactive Video Flashcard

Front

What is an earthquake?

Back

A sudden movement of the Earth's crust

Answer explanation

An earthquake is defined as a sudden movement of the Earth's crust, caused by the release of energy in the Earth's lithosphere. This distinguishes it from tidal waves and weather phenomena, making the first option the correct answer.

Front

What are the four major layers of the earth?

Back

Inner core, outer core, mantle, and crust

Answer explanation

The four major layers of the Earth are the inner core, outer core, mantle, and crust. Option b correctly identifies these layers, while the other options include incorrect or unrelated terms.

Front

What are tectonic plates?

Back

Different pieces of rock that make up the Earth's crust

Answer explanation

Tectonic plates are large, rigid pieces of the Earth's crust that move and interact with each other. They are not small rocks or layers of the atmosphere, making the correct choice 'different pieces of rock that make up the Earth's crust'.

Front

What causes an earthquake?

Back

Movement of tectonic plates

Answer explanation

Earthquakes are primarily caused by the movement of tectonic plates. These plates shift and interact at their boundaries, leading to the release of energy that results in seismic activity.

Front

Where do nearly 90% of all earthquakes begin?

Back

The Pacific Ocean

Answer explanation

Nearly 90% of all earthquakes occur along the Pacific Ocean, particularly in the region known as the Ring of Fire, where tectonic plates meet and create significant seismic activity.

Front

What device do scientists use to measure earthquakes?

Back

Seismograph

Answer explanation

Scientists use a seismograph to measure earthquakes, as it detects and records the vibrations caused by seismic waves. A volcanometer measures volcanic activity, and an altimeter measures altitude, making them unsuitable for this purpose.

Front

What is the epicenter of an earthquake?

Back

The location on the Earth's surface directly above the focus

Front

What magnitude is considered a major earthquake?

Back

8.0

Answer explanation

A major earthquake is defined as one with a magnitude of 7.0 or higher. Therefore, 8.0 is considered a major earthquake, while 5.5 is not significant enough to be classified as such.

Front

What can earthquakes cause besides shaking?

Back

Tsunamis

Answer explanation

Besides shaking, earthquakes can cause tsunamis, which are large ocean waves triggered by underwater disturbances like seismic activity. Windstorms and rain are not direct consequences of earthquakes.

Front

Who studies earthquakes?

Back

Seismologist

Answer explanation

A seismologist is a scientist who studies earthquakes and seismic waves. They analyze data from seismic activity to understand the causes and effects of earthquakes, making them the correct choice for this question.