Earth's Layers and Seismic Waves

Front

What are the four main layers of the Earth?

Back

Crust, Mantle, Outer Core, Inner Core.

Front

What is the composition of the inner core?

Back

The inner core is primarily composed of iron and nickel and is solid due to immense pressure.

Front

What is the lithosphere?

Back

The lithosphere includes the crust and the uppermost portion of the mantle, which is solid and rigid.

Front

What are seismic waves?

Back

Seismic waves are waves of energy that travel through the Earth, typically generated by earthquakes.

Front

What is the difference between P waves and S waves?

Back

P waves (primary waves) are compressional waves that can travel through solids and liquids, while S waves (secondary waves) are shear waves that can only travel through solids.

Front

What does a seismograph do?

Back

A seismograph records the vibrations caused by seismic waves during an earthquake.

Front

What is the outer core made of?

Back

The outer core is primarily composed of liquid iron and nickel.

Front

How do seismic waves help scientists understand the Earth's interior?

Back

Seismic waves change speed and direction when they encounter different materials, allowing scientists to infer the composition and state of Earth's layers.

Front

What is the mantle?

Back

The mantle is the thick layer of rock between the crust and the outer core, composed of silicate minerals.

Front

What is the role of the crust in Earth's structure?

Back

The crust is the outermost layer of the Earth, where we live, and is composed of solid rock.