Plate Tectonics Unit

What erupts through the valley of mid-ocean ridge?

• continental drift
• deep ocean trenches
• molten material

Earth's inner core is a ______________.

• dense ball of solid material
• layer of molten material
• layer of hot rock

The movement of tectonic plates is believed to be caused by

• convection currents in the mantle
• Earth's magnetic field
• the rotation of Earth

Earth's lithosphere is broken into separate sections called __________.

• faults
• plates
• rifts

The place where two plates are sliding past each other is known as a ___________.

• convergent boundary
• divergent boundary
• transform boundary

The place where two plates are dividing (spreading apart) is known as a ___________.

• convergent boundary
• divergent boundary
• transform boundary

The place where two plates are colliding (coming together) is known as a ___________.

• convergent boundary
• divergent boundary
• transform boundary

What feature occurs where plates converge (collide)?

• rift valleys
• mid-ocean ridges
• mountain ranges

How are the ocean crusts moving in sea-floor spreading?

• diverging
• converging
• transforming

According to Wegener's hypothesis of continental drift, _________________.

• the continents were once joined together in a single land mass
• earth is slowly shrinking
• the continents do not move