Continental Drift and Plate Tectonics

Wegener thought that all the continents were once together in one large continent called

• Gondwana.

• Laurasia.

• Eurasia.

• Pangaea.

New oceanic lithosphere (crust) forms as a result of

• sea-floor spreading.

• normal polarity.

• reverse polarity.

• continental drift.

Underwater mountain chains running through Earth’s ocean basins are called

• sea-floor spreading.

• mid-ocean ridges.

• magnetic reversal.

• continental drift.

What type of boundary is formed when plates collide?

• convergent

• horizontal

• divergent

• transform

What type of boundary is formed when plates slide horizontally past each other?

• convergent

• horizontal

• divergent

• transform

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

• global positioning.

• magnetic reversal.

• continental drift.

• oceanic drifts.

Which of the following is associated with transform boundaries?

• slab pull

• magnetic reversal

• sea-floor spreading

• earthquakes

What do scientists use the global positioning system for?

• to measure the Earth’s thickness

• to measure tectonic plate motion

• to make images of tectonic plates

• to locate fossils

Pangaea broke apart about 180 million years ago into northern ______________ and southern Gondwana.

• Antarctica

• Panthalassa.

• Laurasia.

• Arctica.

Magnetic reversals have helped to support

• the theory of Pangaea.

• the age of the Earth.

• sea-floor spreading.

• the theory of Gondwana.