Plate Tectonics

Jamal makes a scale model of Earth for a school project. In his model, he uses different materials to show each layer of Earth. Which layer in his model should be the thinnest?

• Mantle
• Crust
• Outer core
• Inner core

The following diagram shows a cross-section of Earth. Which letter represents the location of the asthenosphere?

• A
• B
• C
• D

The following diagram shows a cross-section of Earth. Which letter represents the location of the asthenosphere?

• A
• B
• C
• D

Which of these describes the lithosphere and the asthenosphere?

• The lithosphere is rigid and immovable, and the asthenosphere is hot and flowing. 
• The asthenosphere is rigid and immovable, and the lithosphere is hot and flowing.
• Both are hot inner layers of earth capable of bending and moving.   
• Both are hard and rigid layers of earth close to the surface.   

Which best describes Earth’s crust?

• It is stationary and unable to move.   
• It is thicker than the mantle and the core.   
• It is located between the outer and the inner core.
• It is composed of continental and oceanic plates.

Which best summarizes the composition of Earth's core?

• It contains a solid outer region surrounding a liquid iron core.
• It contains a liquid outer region surrounding a solid iron core.
• It contains a semi-liquid rock outer region surrounding a liquid core.
• It contains a basalt, semi-liquid outer region surrounding a solid core.

In which layer of Earth can a garden and rocks be found?

• Exosphere 
• Hydrosphere 
• Lithosphere 
• Stratosphere

The diagram below shows four layers of Earth's internal structure.Which layer is composed mostly of solid iron and nickel?

• layer W
• layer X
• layer Y
• layer Z

The following diagram shows a cross-section of the mid-Atlantic Ridge. Which area is likely the oldest crust?

• 1
• 2
• 3
• 4

Which of the following statements best explains why the lower mantle of Earth is much more rigid and dense than the upper mantle?

• The lower mantle is older than the upper mantle.
• The lower mantle is cooler than the upper mantle.
• The lower mantle is under more pressure than the upper mantle.
• The lower mantle is farther from the core than the upper mantle.