Vocabulary
Theories
Boundaries
Mountains
Miscellaneous
100

A deep underwater valley

What is a trench?

100

The scientist who discovered the theory of continental drift

Who is Alfred Wegener?

100

The type of boundary where two plates move away from each other

What is a divergent boundary?

100

Mountains, such as Mount Everest, may still do this just a little each year

What is grow?

100

This is the force that creates the convection currents that cause the plates to move

What is heat?

200

Mountain chain that is formed on ocean floor where plates pull apart

What is an oceanic ridge?

200

The scientist who discovered the theory of seafloor spreading

Who is Harry Hess?

200

The type of boundary where two plates move toward each other

What is a convergent boundary?

200

The place in tectonic plates where most mountain ranges can be found

What is at the edge or boundary?

200

This is the type of boundary where crust is neither created nor destroyed

What is transform?

300

The process of one tectonic plate being pushed under another

What is subduction?

300

Large sections of the crust that move and float on the asthenosphere

What are tectonic plates?

300

The type of boundary where two plates slide past each other

What is a transform boundary?

300

The type of mountain that form at converging boundaries

What is folded mountains?

300

This is the theory that says that the continents float on the asthenosphere, much like an iceberg floats on water

What is isostasy?

400

A break or fracture in earth's crust, along which rocks move

What is a fault?

400

Greek for "all lands," the supercontinent believed to have been all together in one landmass

What is Pangaea?

400

The type of boundary where mid-oceanic ridges and rift valleys are formed

What is a divergent boundary?

400

The type of mountains that form at divergent boundaries

What is fault-block mountains?

400

Evidence that supports this theory include mountain ranges lining up on continents when pieced together, fossils that show the same animals and plants occurred on the now separated continents, and scratches on rocks made from glaciers in places with mild climates today

What is continental drift?

500

The process by which new crust is formed at an oceanic ridge

What is seafloor spreading?

500

The type of boundary where seafloor spreading occurs and new crust is made

What is divergent?

500

The type of boundary where earthquakes frequently occur and metamorphic rock is formed

What is a transform boundary?

500

The type of boundary where mountain chains, island arcs, and deep-ocean trenches are usually found

What is a convergent boundary?

500

Evidence that supports this theory includes molten material shaped like pillows that form when magma erupts and hardens quickly, magnetic stripes showing that earth's magnetic field has reversed and drilling samples that reveal that the farther from a ridge the rocks were taken, the older they were

What is seafloor spreading?