Unit 8 & 9 Earthquakes and Volcanoes

Front

What can happen during a volcanic eruption?

Back

Poisonous gases, pyroclastic flow, volcanic ash, and all answers are correct.

Front

Which type of wave travels fastest through the earth?

Back

Primary waves.

Front

What directly causes an earthquake?

Back

The release of energy.

Front

What area receives the most damage during an earthquake?

Back

The epicenter.

Front

At what magnitude on the Richter Scale does an earthquake begin to show damage?

Back

6 and greater.

Front

What is a volcano?

Back

A volcano is an opening in the Earth's crust where molten rock, ash, and gases can escape.

Front

What is the difference between the focus and the epicenter of an earthquake?

Back

The focus is the point inside the Earth where the earthquake originates, while the epicenter is the point directly above it on the Earth's surface.

Front

What are primary waves?

Back

Primary waves (P-waves) are the fastest seismic waves that travel through the Earth, moving in a compressional motion.

Front

What are secondary waves?

Back

Secondary waves (S-waves) are seismic waves that move slower than P-waves and can only travel through solids.

Front

What is volcanic ash?

Back

Volcanic ash consists of tiny fragments of rock and glass that are ejected during a volcanic eruption.