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Front

What is sea-floor spreading?

Back

Sea-floor spreading is the process by which new oceanic crust is formed at mid-ocean ridges as molten material rises from the mantle and solidifies.

Front

Where does molten material rise during sea-floor spreading?

Back

Molten material rises along mid-ocean ridges.

Front

What is the location of the youngest seafloor in the Atlantic Ocean?

Back

The youngest seafloor is located towards the middle of the ocean.

Front

Who is credited with the idea of sea-floor spreading?

Back

Harry Hess, an American geologist.

Front

What technology was used to map the mid-ocean ridge in the mid-1900s?

Back

Sonar was used to map the mid-ocean ridge.

Front

What causes sea-floor spreading?

Back

Sea-floor spreading occurs because molten material beneath Earth's crust rises to the surface.

Front

What is the role of the asthenosphere in sea-floor spreading?

Back

The asthenosphere is the semi-fluid layer beneath the lithosphere where new material is added during sea-floor spreading.

Front

What are mid-ocean ridges?

Back

Mid-ocean ridges are underwater mountain ranges formed by plate tectonics and are the sites of sea-floor spreading.

Front

What is the significance of sonar technology in oceanography?

Back

Sonar technology allows scientists to map the ocean floor and study underwater features.

Front

What happens to the ocean floor as new material is added during sea-floor spreading?

Back

As new material is added, the ocean floor expands and pushes older crust away from the ridge.