Density/Seismic Waves/Earth's Interior

Front

What is density?

Back

Density is the mass of an object divided by its volume, typically expressed in grams per cubic centimeter (g/cm³).

Front

What is the Earth's inner core primarily made of?

Back

The Earth's inner core is primarily made of iron and nickel.

Front

What causes the inner core to be solid?

Back

The inner core is solid due to the extremely high pressure at the Earth's center, which prevents the iron from melting despite high temperatures.

Front

What is an earthquake?

Back

An earthquake is a sudden shaking of the Earth's surface caused by the movement of tectonic plates.

Front

What are seismic waves?

Back

Seismic waves are waves of energy that travel through the Earth, typically as a result of an earthquake.

Front

What are the two main types of seismic waves?

Back

The two main types of seismic waves are body waves (P-waves and S-waves) and surface waves.

Front

What are Primary (P) waves?

Back

P-waves are the fastest seismic waves that can travel through solids, liquids, and gases.

Front

What are Secondary (S) waves?

Back

S-waves are seismic waves that can only travel through solids and arrive after P-waves during an earthquake.

Front

What is the focus of an earthquake?

Back

The focus is the point within the Earth where an earthquake originates.

Front

What is the epicenter of an earthquake?

Back

The epicenter is the point on the Earth's surface directly above the focus of an earthquake.