Plate Tectonics

According to Wegener's hypothesis of continental drift

• the continents were once joined together in a single land mass known as Pangaea

• Earth is slowly increasing in size however, the land mass in shrinking while the oceans are increasing

• Earth;s surface is made up of 7 major land masses

• the continents have not ever moved

A place where two plates slip past each other, in opposite directions

• divergent boundary

• transform boundary

• convergent boundary

• strike slip

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

• at the north and south poles

• in deep ocean trenches

• along mid ocean ridges

• along the edge of all of the continents

What was the technology used in the mid 1900s to map the ocean floor

• sonar

• satellites

• submarines

• sound waves

The long chain of mountains that form on the ocean floor are

• fault lines

• subduction zones

• deep-ocean trenches

• mid-ocean ridges

Collisions between two continental plates at a convergent boundary produces a

• mid-ocean ridge

• mountain range

• rift valley

• deep-ocean trench

The process where the ocean floor sinks below the deep-ocean trench and back into the mantel is known as

• convection

• continental drift

• subduction

• conduction

Breaks in the earth's crust where rocks have slipped past each other is a ______.

• trench

• plate

• convergent boundary

• fault

The driving force behind plate tectonics

• convection currents in the mantel

• Earth's magnetic field

• Ring of fire

• conduction

The theory that states that pieces of Earth's lithosphere are in constant, slow motion is the theory of

• subduction

• plate tectonics

• deep -ocean trenches

• sea-floor spreading