The study of Earth's oceans is called

Large pieces of the lithosphere are called

Chains of undersea mountains are called

The process by which molten material adds new oceanic crust to the ocean floor is called

The process by which oceanic crust sinks back into the mantle at an ocean trench is called

An undersea valley that is the deepest part of the ocean is called

The edges of __________________ seem to mirror the edges of the continents.

Molten rock flows up through a crack in the Earth’s crust and hardens into solid strips of new rock on _________ of the crack.

The entire floor on either side of the __________________ moves away (the older strips move farther away over time) like conveyor belts.

The ________________________ rocks are located at the mid-ocean ridge.

The further the distance from the mid-ocean ridge, the _________________ the rock is!

If the seafloor is spreading, does that mean that the Earth is getting larger?

New oceanic crust is relatively ____________________.

As the rock cools and moves away from the mid-ocean ridge, it becomes _________.

At _______________________, the more dense oceanic crust will sink under the edge of a continent or a younger, less dense oceanic crust.

The crust that sinks will be recycled back into the _________________.

If oceanic crust meets ____________________________, a chain of volcanoes can form.

If oceanic crust meets___________________, it can produce a chain of volcanic islands.

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