Continental Drift, Sea-floor Spreading, & Plate Boundaries

Front

Fossils of a dinosaur have been found in both southern Africa and South America but nowhere else. What does this mean?

Back

In the past, Africa and South America were part of the same continent.

Front

The average density of one of the continental crusts is 2.8 g/cm³ and the average density of one of the oceanic crusts is 3.2 g/cm³. If these two plates came together, what could be expected to happen?

Back

The oceanic plate would be pushed under the continental plate.

Front

Sea-floor spreading states that new ocean crust is being formed constantly. Which of the following is also true? The oceans are constantly getting bigger., The amount of land on earth is constantly increasing., The amount of land on earth remains the same due to subduction., When the size of the crust reaches a certain amount, sea-floor spreading will stop.

Back

The amount of land on earth remains the same due to subduction.

Front

What occurs when sea-floor spreading? New oceanic crust, mid-ocean ridge, earthquakes

Back

New oceanic crust, mid-ocean ridge, earthquakes

Front

Fossils of a dinosaur have been found in both southern Africa and South America but nowhere else. What does this mean?

Back

In the past, Africa and South America were part of the same continent.

Front

Climate change over time is evidence to support the theory of continental drift. Which example below supports this evidence?

Back

Antarctica drifted farther from the equator causing its climate to cool.

Front

Where does Ridge Push happen?

Back

At divergent boundaries, convection causes hot magma to rise and reach the surface. It cools as lava, and then gravity pushes the rocks down.

Front

What process is occurring at Z? Convection currents, Subduction, Two plates moving apart, New ocean floor forming

Back

Subduction

Front

Why does the ocean floor sink beneath the continent at Z?

Back

The ocean floor is more dense than the continent.

Front

How do Mid-Ocean Ridges support both the idea of continental drift and the theory of plate tectonics?

Back

New crust forms at mid-ocean ridges.