Smithsonian Earth's Dynamic Systems

What is the cycle of heated material rising and cooler material sinking?

• convection current
• asthenosphere
• continental drift
• seafloor spreading

What is the part of Earth that combines the upper mantle and the crust?

• asthenosphere
• lithosphere
• plate
• Pangaea

What is the part of Earth that is made up of the lower mantle?

• lithosphere
• seafloor spreading
• asthenosphere
• Hess

What happens when large land masses move towards or away from each other?

• convection current
• seafloor spreading
• plate tectonics
• continental drift

Who came up with the seafloor spreading theory?

• Hess
• Mr. Bergeson
• Wegener
• George Washington

What was the large landmass when all of the continents were together?

• asthenosphere
• Pangaea
• plate
• Wegener

What is a section of Earth that is free to move around?

• plate tectonics
• Pangaea
• plate
• lithosphere

What is the theory that combines continental drift and seafloor spreading?

• Pangaea
• Hess
• convection current
• plate tectonics

What happens when the bottom of the ocean spreads out?

• seafloor spreading
• plate tectonics
• convection current
• continental drift

Who came up with the continental drift theory?

• Lee
• Wegener
• Hess
• Betty Ross