Plate Tectonics

When continental plates pull apart at a divergent boundary on land, a ( ) forms.

• deep ocean trench

• rift valley

• mountain

• volcano

List two examples of continents that have drifted apart from each other.

• South America and Africa

• North America and India

According to the theory of plate tectonics, which layer of the earth is broken into separate sections called plates?

• core

• lithospehere

• mesopshere

• asthenosphere

Along a divergent boundary, two plates slip past each other, moving in opposite directions.

• True

• False, transform boundary

In sea-floor spreading, molten material rises from the mantle and erupts....

• in deep-ocean trenches

• along the edges of all the continents

• at the north and south poles

• along mid-ocean ridges

A continental plate collides with an oceanic plate at a ( ) boundary.

• transform boundary

• divergent boundary

• convergent boundary

Mid-ocean ridges form the longest mountain ranges on Earth.

• True

• False, shortest

Any trace of an ancient organism that has been preserved in rock is called a ......

• continent

• landform

• fossil

• landmass

The hypothesis of ( ) was that all the continents once were joined as a single super continent and have since drifted apart.

• continental drift

• super continents

• sea-floor spreading

• deep ocean trench

Old oceanic crust is more dense than new oceanic crust because it is....

• closer to the mid-ocean ridge

• hot

• moving toward a deep-ocean trench

• cool