Continental Drift & Sea Floor Spreading

What did scientists use to map the oceans floor?

• Echo-location

• Sonar

• Space Shuttles

• Animals

The theory of continental drift named a key part of this idea Pangaea. What is Pangaea?

• One of the ancient animals that helped Wegener prove that fossils from different continents originally came from the same location
•  supercontinent that existed in Earth's distant past
• The underwater ocean range in the middle of the ocean
• The hot spot which gave rise to the Hawaiian Islands, among others

How does fossil evidence support Wegener's hypothesis of continental drift?

• Similar fossils are found along continents that appear to join together.

• Fossils are found in areas where the present-day climate could not have supported the organisms that made the fossils.
• Similar fossils of giant, land-dwelling dinosaurs are found on continents separated by oceans.
• all of the above

EVIDENCE QUESTION: Which organism was a reptile whose fossils are found on Antarctica, but couldn't survive in Antarctica today?

• Mesosaurus

• Lystrosaurus

• Cynoganthus

• Glossopteris

Scientists think that the continents once formed a giant landmass that broke apart, and then slowly drifted apart. What is the name given to this hypothesis?

• sea-floor Spreading

• plate tectonics

• continental drift

• Pangaea

Where does subduction or sinking of old crust occur in the oceans?

• mid-ocean ridges

• deep sea trenches

• hot springs

• mountains

EVIDENCE QUESTION: Which organism had webbed feet and a strong tail to swim (in fresh water), and could never swim across today's oceans - however, their fossils were found in both South America & Africa?

• Mesosaurus

• Lystrosaurus

• Cynoganthus

• Glossopteris

What do "pillow" and "toothpaste" rocks teach us about mid ocean ridges

• That they're good spots to vacation

• That they have magnetic stripes

• That they are volcanic

• That they are old

Who is credited with thinking up the concepts of Sea floor spreading & subduction

• Alfred Wegener

• Harry Hess

• Bill Nye

• Marie Curie

There are long mountain belts that divide the sea floor and generate new sea floor as magma rises and erupts onto Earth's surface. What are these mountain belts known as?

• magnetic poles

• mid-ocean ridges

• ocean trenches

• subduction zones