Science 10: Chapter 2 Quiz

An S-wave shadow zone is formed as seismic waves travel through the Earth’s body. Which of the following statements does this S-wave shadow zone indicate?

• The inner core is liquid.

• The inner core is solid.

• The mantle is solid.

• The outer core is liquid

Why are there no P-waves or S-waves received in the P-wave shadow zone?

• P-waves are aboserbed and S-waves are refracted by Earth’s outer core.

• P-waves are refracted and S-waves are absorbed by Earth’s outer core.

• Both the P-waves and S-waves are refracted by Earth’s outer core.

• Both the P-waves and S-waves are absorbed by Earths outer core.

What makes up the lithosphere?

• Continental crust

• Crust and the upper mantle

• Oceanic crust and continental crust

• Upper mantle Answer: B

Miners dig into the Earth in search for precious rocks and minerals. In which layer is the deepest explorations made by miners?

• Crust

• Mantle

• Inner core

• Outer core

How do you compare the densities of the Earth’s crust, mantle and core?

• The mantle is less dense than the core but denser than the crust.

• The mantle is less dense than both the core and the crust.

• The mantle is denser than the core but less dense than the crust.

• The mantle is denser than both the core and the crust.

The movement of the lithospheric plates is facilitated by a soft, weak and plastic-like layer. Which of the following layers is described in the statement?

• Asthenosphere

• Lithosphere

• Atmosphere

• Mantle

Alfred Wegener is a German scientist who hypothesized that the Earth was once made up of a single large landmass called Pangaea. Which of the following theories did Wegener propose?

• Continental Drift Theory

• Plate Tectonics

• Continental Shift Theory

• Seafloor Spreading Theory Answer: A

If you are a cartographer, what will give you an idea that the continents were once joined? a

• Ocean depth

• Shape of the continents

• Size of the Atlantic Ocean Answer: C

• Position of the south pole

Which observation was NOT instrumental in formulating the hypothesis of seafloor spreading?

• Depth of the ocean

• Identifying the location of glacial deposits

• Magnetization of the oceanic crust

• Thickness of seafloor sediments

As a new seafloor is formed at the mid-ocean ridge, the old seafloor farthest from the ridge is destroyed. Which of the stated processes describes how the oceanic crust plunges into the Earth and destroyed at the mantle?

• Convection

• Construction

• Diversion

• Subduction