Sea-floor spreading is characterized by 2 adjacent plates moving toward each other.

Newly formed rocks can be found on the ocean floor.

When lithospheric plates meet, volcanoes are often formed.

Scientists have discovered that the ocean floor is totally flat.

Mid-ocean ridges are the result of plate convergence.

Continents can be part of tectonic plates.

Rocks on the ocean floor containing iron emit a magnetic field.

The mid-ocean ridge is over 80,000 kilometers in length.

Tectonic plates are in a constant state of swift (fast) motion.

____ is the process of one lithospheric plate descending under another.

There are ____ major lithospheric plates on the earth.

_____ theorized that present day continents once were joined together in a large continent.

A boundary where two plates slide by each other is called a ____.

A ____ is the place where plates meet.

The ____ is the largest plate.

Tectonic plates consist of the crust and upper mantle, and when combined make up the ____.

Volcanic activity occurs along mid-ocean ridges in large cracks called ____.

A ____ boundary forms where plates are separating.

____ are movements of material caused by differences in temperature.