A supercontinent made up of the present-day continents

The hypothesis that continents are in constant motion

Today's magnetic field; magnets orient themselves to point north

Magnetic field in which magnets orient themselves to point south

When new oceanic crust forms at a mid-ocean ridge as old oceanic crust moves away

Mountain range on the seafloor in the middle of the ocean

Event in which the magnetic field reverses direction

circulation of materials caused by differences in temperature and density

Theory that the Earth's surface is made of plates that move

When two plates collide

When two plates slide past each other

Where two plates move away from each other

The sinking of a denser plate under a more buoyant plate. This happens at convergent boundaries.

Magnetic stripes on the seafloor show that

Convection in the Earth's mantle causes

A subduction zone is located at a __________________boundary.

Most mountains on Earth's continents are formed along _________plate boundaries.

Where would you expect the oceanic crust to be the hottest?

The boundary that causes many earthquakes

The area around the Pacific Ocean that contains many volcanos is called the

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