Seafloor Spreading and Subduction

While new earth is being "born" at mid-ocean ridges by __________, in other areas earth is being "destroyed" at deep-ocean trenches by ___________.

Seafloor spreading; subduction

What is seafloor spreading?

The process of molten material from the mantle being pushed upward to the surface of the earth and spreading apart creating new earth.

Explain how the earth's crust is constantly recycling and renewing itself.

The seafloor is spreading 5 cm every year and the magma from the mantle is being pushed up. It cools down by the water and makes a new crust.

What does subduction cause?

This causes mountain folding and volcanoes.

What is sub duction?

This is where one lithospheric plate collides and plunger down into the mantle.

What are mid-ocean ridges?

This is where seafloor spreading occurs.

Where does subduction occur?

This process occurs along convergent boundaries and areas called deep ocean trenches.

Where does seafloor spreading occur?

This process occurs along divergent plate boundaries at areas called mid-ocean ridges.

What does seafloor spreading cause?

This this is causing North America and South America to move away from Europe and Africa.