Continental Drift and Seafloor Spreading

What is seafloor spreading?

• When magma erupts from mid-ocean ridges and creates new oceanic crust
• When magma erupts from deep ocean trenches and creates new oceanic crust
• When ice cream erupts from mid-ocean ridges and creates new oceanic crust
• When the seafloor spreads apart

What are three pieces of evidence that support seafloor spreading?

• Ocean material, zebra stripes, drilling samples
• Terrain features, fossils, climate
• Ocean material, magnetic stripes, drilling samples
• Ocean material, magnetic stripes, fossil samples

True or False: Most scientists did not accept Wegener's theory of continental drift. 

• True
• False

What is Glossopteris?

• A fernlike plant that wasn't found on many major land masses that had broken apart
• A fernlike plant that was found on many major land masses that had broken apart
• Gloss on pottery
• A treelike plant that was found on many major land masses that had broken apart

What was Pangaea?

• A supercontinent that existed about 250 million years ago
• Wegener's breakfast
• A supercontinent that existed about 350 million years ago
• A supercontinent that existed about 300 million years ago

What is a fossil?

• Any trace of an ancient organism that has been preserved in rock
• Any trace of a recent organism that has been preserved in rock
• Any piece of rock
• Dead things

True or False: Fossils of tropical plants were found on an island in the Arctic Ocean.

• True
• False

True or False: Sonar wasn't used to map mid-ocean ridges.

• True
• False

What are mid-ocean ridges?

• Ridges in the middle of the ocean
• Mountain ranges at which seafloor spreading may or may not occur
• Seafloor spreading
• Underwater mountain ranges at which seafloor spreading occurs

What is subduction?

• A process in which oceanic crust is recycled into the mantle through deep ocean trenches
• A process in which continental crust is recycled into the mantle through deep ocean trenches
• Subterranean duct tape
• A process in which oceanic crust is created at mid-ocean ridges