Layers of the Earth Review

Convection currents in this layer move tectonic plates.Which of Earth's layers does this statement describe?

• inner core
• outer core
• mantle
• crust

Which statement correctly explains how convection causes movement of the crustal plates?

• Crustal plates move when tides are high on one side of Earth and low on the other side.
• Crustal plates move when hot magma rises and more dense, cooler magma sinks.
• Crustal plates move when the moon's gravity pulls on different parts of Earth.
• Crustal plates move when water inside Earth's core changes from liquidto vapor.

The four layers of the Earth from the outermost layer to the innermost layer are:

• inner core, outer core, mantle, crust
• mantle, crust, outer core, inner core
• crust, mantle, outer core, inner core
• crust, outer core, mantle, inner core

What are characteristics of the inner core?

• It is the hottest.
• It has the highest density.
• Both A and B.
• Neither A nor B.

Which layer of the Earth has the lowest density?

• Inner core
• Outer core
• Mantle
• Crust

Which best describe the Earth's crust?

• A thick layer of hot, melted rock
• A thick layer of solid hot metal
• A thin layer of cool rock
• A thick layer of liquid metals

Which best describes the Earth’s mantle?

• The center of the Earth
• Home to all life on Earth
• Thickest layer of hot rock
• Thinnest and hottest layer

Which statement correctly describes plate tectonics?

• the process by which convection currents move Earth's crustal plates
• the process by which layers are added to earth's atmosphere
• the process by which Earth's north and south magnetic poles are created
• the process by which heat is generated inside Earth's core

Tectonic plates are part of which layer of the Earth?

• Lithosphere
• Asthenosphere
• Mantle
• Outer core

At the Divergent boundary crust is being ______.

• Created
• Destroyed
• Neither created nor destroyed
• Both created and destroyed