Front

What is the study of the history of Earth's magnetic field called?

Back

Paleomagnetism

Front

What occurs when the flow in the outer core changes, causing Earth's magnetic field to change direction?

Back

Magnetic reversal

Front

Seafloor spreading can be compared to which of the following?

Back

Conveyor belt

Front

What sediment evidence led to the discovery of seafloor spreading?

Back

Layers of sediments on the ocean floor are much thinner than layers of sediment on continents.

Front

What device can detect small changes in magnetic fields?

Back

Magnetometer

Front

What is seafloor spreading?

Back

The process by which new oceanic crust is formed at mid-ocean ridges and older crust is pushed away.

Front

What geological feature is formed at divergent boundaries?

Back

Mid-ocean ridges.

Front

What is the significance of the age of oceanic crust in relation to seafloor spreading?

Back

The age of oceanic crust increases with distance from mid-ocean ridges, supporting the theory of seafloor spreading.

Front

What is the role of tectonic plates in seafloor spreading?

Back

Tectonic plates move apart at divergent boundaries, allowing magma to rise and create new crust.

Front

What is the relationship between seafloor spreading and continental drift?

Back

Seafloor spreading provides a mechanism for continental drift by creating new oceanic crust that pushes continents apart.