3.3 Plate Tectonics and Continental Drift

What is the Theory of Continental Drift?

• New continents are continually being created

  and destroyed.

• The layout of the continents is the same today

  as it has always been

• The continents have always been separate but

  may one day drift together to form a single

  continent

• All the continents were once one continent that

  broke up and drifted apart over hundreds of

  millions of years

When crust is neither created nor destroyed, what boundary is it formed along?

• convergent

• divergent

• collisional

• transform

What type of tectonic plate boundary involves a collision of plates?

• transform

• divergent

• convergent

• obstructive

Where do most volcanoes occur?

• convergent boundaries

• in deserts

• on coastal plains

• divergent boundaries

What is responsible for the volcanoes and mountain ranges?

• Weathering

• Super-nocturnal tides

• Hurricanes

• Plate Tectonics

When tectonic plates of more density and less density collide, what happens?

• The plate that is more dense fractures.

• The plate that is more dense rises.

• The plate that is less dense subducts.

• The more dense plate subducts.

Continents to continent plate boundaries produce what feature when they collide?

• Rift Valleys

• Mid-ocean ridges

• Tall mountain ranges

• Deep-sea trenches

What type of boundary exists when 2 plates are pulling apart?

• Convergent

• Transform

• Obtrusive

• Divergent

Where do volcanoes and earthquakes occur?

• Under the flat surface of plates

• Above the flat surface of the plates

• Along plate boundaries

• At the center of plate

The cause of earthquakes and how they are formed is the

• Greenhouse Effect in the Ozone

• melting of glacial ice in global warming

• movement of continental plates

• meteors that hit earth's surface from space