Introducing Earth: Part A

What is the correct order (starting from the surface) of Earth’s layers?

• crust, outer core, inner core, mantle

• mantle, outer core, inner core, crust

• crust, mantle, outer core, inner core

• outer core, inner core, crust, mantle

Using data from seismic waves, geologists have learned that Earth’s interior is made up of several...

• continents.

• layers.

• ridges.

• trenches.

Which of Earth’s layers is the thickest?

• the crust

• the mantle

• the outer core

• the inner core

Which part of Earth contains most of its mass?

• the biosphere

• the hydrosphere

• the atmosphere

• the geosphere

Earth’s inner core is

• a dense ball of solid metal.

• a layer of molten metal.

• a layer of hot rock.

• a layer of rock that forms Earth’s outer skin.

Which part of Earth contains plates?

• hydrosphere

• atmosphere

• core

• lithosphere

According to the theory of plate ____________________, Earth’s plates move very slowly in various directions.

• discs

• tectonics

• plates

• fields

In the mantle, heat is transferred as soft rock flows slowly in cycles known as _________________________.

• Conduction currents

• Radiation currents

• Plate tectonics

• Convection currents

Scientists think that the ____________________, made of liquid iron and nickel, moves to produce Earth’s magnetic field.

• Outer core

• Inner core

• Ocean waves

• Wind currents

What is NOT one major difference between oceanic crust and continental crust?

• Type of rock (basalt and granite)

• The thickness of the two crusts.

• The layer of the earth is different.

• The age of the two crusts.