Plate Tectonics

The idea that continents were once part of a single landmass that broke apart and moved:

• Continental drift

• Transform

• Tectonic Plates

Forms where plates are moving away from each other:

• Divergent boundary

• Transform boundary

• Convergent boundary

Formed where two sections of Earth's crust are colliding:

• Divergent boundary

• Convergent boundary

• Transform boundary

The land mass where all of the continents were once together in one large continent is called ____________.

• Laurasia

• Eurasia

• Pangaea

• Gondwana

Tectonic plates consist of:

• continental crust

• both continental and oceanic crust

• oceanic crust

• mesosphere

The fact that similar fossils are found on both sides of the ocean is evidence of:

• magnetic reversal

• global positioning

• continental drift

• oceanic drift

The movement of the tectonic plates is caused by:

• The rotation of the Earth

• The gravity of the iron-nickel core

• The Moho discontinuity

• Convection currents in the asthenosphere

Observe this diagram of a plate boundary. One statement BEST describes what is happening. It is that:

• The oceanic crust is melting.

• Volcanic islands are forming.

• The denser oceanic crust is subducting under the less dense oceanic crust.

• The tectonic plates are moving away from each other.

Most geologists think that the movement of Earth's plates is caused by _________.

• Convection

• Conduction

• Continental drift

• Subduction

What are the two types of crust?

• Continental and oceanic

• Lower and upper

• Ocean and upper

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