A __________ is a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle.

• deep-ocean trench
• rift valley
• sea-floor spreading
• mid-ocean ridge

_____________ is a plate boundary where two plates move away from each other.

• Convergent boundary
• Transform boundary
• Divergent boundary
• Insurgent boundary

_____________ is when two plates move toward each other.

• Convergent boundary
• Allegiant boundary
• Transform boundary
• Sliding boundary

A _____________ is when two plates move past each other in opposite directions.

• emergent boundary
• divergent boundary
• transform boundary
• convergent boundary

___________ is the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle.

• Seismic waves
• Convection current
• Divergent boundary
• Plate tectonics

Mountains form from ...

• plates sliding past one another
• collision of plates
• plates moving away from each other

During sea floor spreading, molten material rises up from the mantle...

• along the continents
• at the mid ocean ridges
• deep ocean trenches
• at north and south poles

What happens to temperature as you go deeper in the Earth?

• decreases
• increases
• fluctuates
• remains the same

Name the boundary

• convergent boundary
• divergent boundary
• transform boundary
• sergent boundary

Scientists hypothesize that a super continent existed 200 million years ago.  This continent is called

• America
• Super Earth
• Pangea
• Eurasia