Chapter 9 study guide

The circulation of material caused by differences in density is called convection.

• True

• False

 As new seafloor moves away from an ocean ridge, the seafloor cools and becomes less dense than the material beneath it.

• True

• False

 The weight of a subducting plate helps to pull the lithosphere into a subduction zone in a process called ridge push.

• True

• False

 Scientists at the time rejected Wegener’s hypothesis of continental drift because he could not explain how or why Earth’s continents move.

• True

• False

The hypothesis that continents have slowly moved to their current locations is called ____.

• continental drift

• continental slope

• magnetic reversal

• convection

Matching ____ on different continents are evidence for continental drift.

• river systems

• rock structures

• weather patterns

• wind systems

Crust is neither destroyed nor formed along which of the following boundaries?

 

• convergent

• divergent

• transform

• magnetic

Plates move apart at ____ boundaries.

 

• convergent

• stable

• divergent

• transform

____ is a fossil fern that helped support Wegener’s hypothesis of continental drift.

 

• Gondwanaland

• Kannemeyerid

• Mesosaurus

• Glossopteris

Plates of the lithosphere float on the ____.

 

• crust

• asthenosphere

• core

• atmosphere