Seafloor Spreading

Front

What is seafloor spreading?

Back

Seafloor spreading is the process by which new oceanic crust is formed at mid-ocean ridges and gradually moves away from the ridge, leading to the expansion of ocean basins.

Front

Where are the oldest rocks found in relation to mid-ocean ridges?

Back

The oldest rocks are found farthest from the mid-ocean ridges.

Front

Who proposed the theory of seafloor spreading?

Back

Harry Hess proposed the theory of seafloor spreading.

Front

What are convection currents?

Back

Convection currents are the circular movements of molten rock in the mantle caused by the heat from the Earth's core, which drive the movement of tectonic plates.

Front

What is the significance of mid-ocean ridges?

Back

Mid-ocean ridges are underwater mountain ranges where seafloor spreading occurs, and new oceanic crust is formed.

Front

What is the relationship between mid-ocean ridges and oceanic crust age?

Back

The age of oceanic crust increases with distance from mid-ocean ridges; the crust is youngest at the ridge and oldest farther away.

Front

What role do deep ocean trenches play in plate tectonics?

Back

Deep ocean trenches are areas where one tectonic plate is being subducted beneath another, often leading to volcanic activity.

Front

What is the process of subduction?

Back

Subduction is the process by which one tectonic plate moves under another and sinks into the mantle.

Front

How does seafloor spreading contribute to the theory of plate tectonics?

Back

Seafloor spreading provides evidence for the movement of tectonic plates, showing how continents can drift apart over geological time.

Front

What is the main driving force behind seafloor spreading?

Back

The main driving force behind seafloor spreading is the heat from the Earth's interior, which causes convection currents in the mantle.