Check-up Quiz: Internal Layers of the Earth

Plates move because of convection currents in the __________.

• Crust

• Inner core

• Outer Core

• Mantle

Which of the following is true about P-waves and S-waves?

• P waves travel faster than S waves

• Only P waves are detected in seismographic situations

• S waves reach the surface of the Earth faster than P waves do.

• P and S waves are refracted when reached the inner core

What is the mechanism that makes the inner core solid despite of its high temperature?

• Pressure freezing

• Shadow zone

• Compressional waves

• Refraction of waves

Which of the following layers is not on solid phase?

• Mantle

• Inner Core

• Outer Core

• Crust

What are the characteristics of the Earth's inner core?

• It is made of ferro-magnesium silicates

• It is the hottest part of the earth. It is a solid mass of iron and nickel. The temperature is around 6'000°C.

• It is made of solid material that can flow very slowly.

• It is made up of iron and nickel though it is in liquid form.

Who among the following scientist proposed that earth inner core is solid and outer core is liquid?

• Inge Lehman

• Beno Guttenberg

• George Cuvier

• Andrija Mohorovicic

What has been the most useful method for determining the structure of the earth's interior?

• Magnetic fields

• Seismology

• Deep excavation and exploration

• Density studies

What is the lithosphere composed of?

• The continental and oceanic crust

• The crust and uppermost mantle

• The lower mantle

• The lower mantle and outer core

The Gutenberg discontinuity lies at the boundary of what two layers?

• Crust and mantle

• Crust and outer core

• Mantle and inner core

• Mantle and outer core

Which of the following statements is false?

• Compression waves travel through solids as well as liquids

• In all materials S-waves travel faster than P-waves

• Seismic waves always slow down when reaching a liquid or partially liquid layer

• The speed of seismic waves generally increases with depth in a layer

• When seismic waves pass from one material to another, the path of the waves is refracted