Plate Tectonics

Which of these provides evidence that Africa and South America were once joined?

Which process adds more crust to the ocean floor?

Which of these is the longest mountain range on Earth?

Most geologists of Wegener's time _.

Along a divergent boundary, two plates slip past each other, moving in opposite directions.

In sea-floor spreading, molten material rises from the mantle and erupts _.

Wegener inferred that the ancient plants Mesosaurus and Lystrosaurus lived on a single landmass

Most transform boundaries occur along mid-ocean ridges.

Which theory describes the movement of Earth's plates?

The geological theory that Earth's lithosphere is in constant slow motion is the theory of _.

The process of _ continually adds new crust to the ocean floor.

The San Andreas fault is an example of which kind of boundary?

Any trace of an ancient organism that has been preserved in rock is called a _.

The hypothesis of _ was that all the continents were once joined as a single continent.

Most geologists think that the movement of Earth's plates is caused by

What technology did scientists use to map the mid-ocean ridge?

Where does subduction occur?

Molten material erupts outside the central valley of mid-ocean ridges.

Earth's plates meet at boundaries.

A place where two plates slip past each other, moving in opposite directions, is known as a _.

A rift valley forms where plates diverge on land.

Plates slide past each other at convergent boundaries.

If subduction occurs faster than oceanic crust can be created, an ocean will expand.

Which feature forms at convergent boundaries.

Breaks in the crust are called faults.

What is Pangaea?

A collision between two pieces of continental crust at a converging boundary produces a _.

Mid-Ocean ridges form the longest mountains on Earth.

_ of Glossopteris provided evidence for Wegener's hypothesis.

Old oceanic crust is more dense that new oceanic crust because it is _.

Oceanic crust near the mid-ocean ridge is younger than oceanic crust farther away.

The lithosphere is broken into sections called _, which float atop the asthenosphere.

Ocean currents drive Earth's plates.

According to Wegener's hypothesis of continental drift,

The pattern of magnetic stripes in rocks on either side of a mid-ocean ridge is the same.

The mountain ranges on the continents of South America and _ line up.