Continental Drift/Plate Tectonics Test

The seafloor spreading theory was proposed by_____________.

• Alfred Wegner

• Harry Hess

• Abraham Ortelius

• Carl Sagan

As Earth's plates move apart at some boundaries, they collide at others, forming______________.

• mountains and volcanoes

• ocean basins

• strike-slip faults

• both a and b

The youngest rocks in the ocean floor are located at the ______________.

• volcanoes

• basins

• trenches

• mid-ocean ridges

The San Andreas fault in California is found along this type of plate boundary.

• Compression

• Transform

• Pacific

• Divergent

The presence of the same ________________ on several continents support the idea of Continental Drift.

• fossils

• rocks

• neither a nor b

• both a and b

The cycle of heating, rising, cooling, and sinking is called a _____________.

• subduction zone

• convergent boundary

• convection current

• conduction current

Oceanic plates are pushed down into the upper mantle in _____________________.

• convection currents

• subduction zones

• strike-slip faults

• divergent boundaries

The hypothesis that continents have moved slowly to their current locations is called _______________.

• continental drift

• continental slope

• magnetism

• convection

Plates move apart at____________________ boundaries.

• convergent

• transform

• divergent

• magnetic

Seafloor spreading occurs because _________________.

• new material is being added to the asthenosphere

• earthquakes break apart the ocean floor

• sediments accumulate on the ocean floor

• hot, less-dense material below Earth's crust is forced upward toward the surface