Seafloor Spreading Theory

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, causing the ocean floor to expand.

Front

Where is the oldest seafloor located?

Back

The oldest seafloor is located farthest from the mid-ocean ridge.

Front

What technology do scientists use to map the ocean floor?

Back

Scientists use sonar (Sound Navigation and Ranging) to map the ocean floor.

Front

What happens to the Pacific Ocean over time?

Back

The Pacific Ocean is shrinking because ocean crust in the Pacific is being recycled faster than it is being created.

Front

What are mid-ocean ridges?

Back

Mid-ocean ridges are underwater mountain ranges formed by plate tectonics, where new oceanic crust is created.

Front

In which oceans can mid-ocean ridges be found?

Back

Mid-ocean ridges can be found in all of Earth's oceans.

Front

What is the significance of the mid-ocean ridge?

Back

The mid-ocean ridge is significant because it is the site of seafloor spreading and the creation of new oceanic crust.

Front

What is the role of tectonic plates in seafloor spreading?

Back

Tectonic plates move apart at mid-ocean ridges, allowing magma to rise and create new seafloor.

Front

What is the relationship between seafloor age and distance from the mid-ocean ridge?

Back

The age of the seafloor increases with distance from the mid-ocean ridge; the oldest rocks are found farthest from the ridge.

Front

How does sonar work in mapping the ocean floor?

Back

Sonar works by sending sound waves into the water and measuring the time it takes for the echoes to return, allowing scientists to create maps of the ocean floor.