Earth Composition and Plate Tectonics

What are the three main layers of the Earth?

• lithosphere, hydrosphere, atmosphere

• crust, core, atmosphere

• crust, mantle, core

• mantle, outer core, inner core

What type of boundary occurs when two tectonic plates move away from each other?

• Subduction boundary

• Convergent boundary

• Transform boundary

• Divergent boundary

Who proposed the theory of continental drift?

• Marie Curie

• Alfred Wegener

• Isaac Newton

• Charles Darwin

What process occurs at mid-ocean ridges where new oceanic crust is formed?

• Continental drift

• Oceanic trenching

• Subduction

• Seafloor spreading

What type of boundary occurs when two tectonic plates collide and one is forced beneath the other?

• Convergent boundary

• Divergent boundary

• Transform boundary

• Subduction zone

What type of boundary occurs when two tectonic plates slide past each other horizontally?

• Divergent boundary

• Transform boundary

• Convergent boundary

• Subduction boundary

Which layer of the Earth has the highest density?

• Atmosphere

• Crust

• Mantle

• Inner core

Which layer of the Earth is composed of solid iron and nickel?

• Inner core

• Outer core

• Crust

• Mantle

What is the name of the supercontinent that existed millions of years ago before breaking apart?

• Gondwana

• Eurasia

• Pangaea

• Atlantis

What is the name of the process where older oceanic crust is pushed back into the mantle at subduction zones?

• Convection

• Erosion

• Subduction

• Deposition