Which compositional layer of Earth is the thinnest?

• Crust

• Mantle

• Inner Core

• Outer Core

Look at the picture. Which statement is true?

• A is the crust, B is the core, and C is the mantle.

• A is the core, B is the mantle and C is the crust.

• A is the inner core, B is the outer core, C is the mantle

• A is the core, B is the crust and C is the mantle.

How are oceanic and continental crust different?

• Oceanic crust is thinner and lighter than continental crust.

• Oceanic crust is thicker and lighter than continental crust.

• Oceanic crust is thinner and denser than continental crust.

• Oceanic crust is thicker and denser than continental crust.

Which of the following is a process that occurs at divergent boundaries?

• magnetic reversals

• recycling of crustal material

• formation of continental crust

• formation of mid-ocean ridges

What can you infer from the figure?

• Oceanic crust is denser than continental crust.

• Continental crust is denser than oceanic crust.

Which statement below shows the correct definition of a tectonic plate boundary?

• At a divergent boundary, plates separate.

• At a transform boundary, plates move apart.

• At a convergent boundary, plates slide past each other.

• At a divergent boundary, one plate sinks under another plate.

In what units is the movement of tectonic plates measured?

• meters/day

• meters/week

• centimeters/year

• kilometers/month

What happens at a subduction boundary?

• An ocean forms.

• Volcanic mountain ranges form.

• Sea-floor spreading occurs as the oceanic plate moves.

• A transform boundary forms where the subduction occurs.

Alfred Wegener proposed............

• continental drift

• continental rise

• continental slope

• continental slope

When 2 plates move together.

• diverging

• transform

• converging

• sea floor spreading