PLATE TECTONICS

Subduction is

• the process by which more dense oceanic crust sinks (like a SUBmarine) beneath a less dense crust forming deep ocean trenches

• the direct transfer of heat through solid materials

• the process that continually adds new ocean floor

• a device that bounces sound waves off of underwater objects

Earth's lithosphere is broken into seperate sections called

• trenches

• plates

• faults

• rifts

Who first proposed the hypothesis of continental drift?

• Harry Hess

• Alfred Wegener

• Albert Einstein

• Alexander Volta

A place where 2 plates slip past (side by side) each other in opposite directions is

• divergent boundry

• subduction zone

• convergent boundrty

• transform boundry

Convection currents take place in the

• lithosphere

• outer core

• mesosphere

• asthenoshpere

The process that continually adds new material to the ocean floor is

• erosion

• conduction

• sea-floor spreading

• subduction

Scientists rejected Wegener's hypothisis because he could not

• explain why continental crust sinks beneath trenches

• describe the climate of Pangea

• explain what force pushes and pulls continents

• describe how seeds moved from Africa to South America

What type of plate boundry is located where two plates move away (divide) from each other?

• transform

• convergent

• divergent

• subduction

The supercontinent that began to break apart about 225 million years ago is called

• Australia

• Eurasia

• Pangea

• Africa

A vast, underwater mountain chain is called

• deep-sea trench

• ocean floor sediment

• mid-ocean ridge

• oceanic crust