4.6: Seafloor Spreading

Multiple Choice

What type of symbiosis?  Hummingbirds feed on nectar from flowers.  The flowers are pollinated by hummingbirds as they move from flower to flower.

• commensalism
• mutualism
• parasitism
• predation

Multiple Choice

What evidence did Wegener use to support his theory?

• Continents and fossils fitting together/matching-up like puzzle pieces

• glacier scars and other climate evidence from temperature

• mountain ranges and rocks line up across continents

• all of the above

Multiple Choice

Wegener found fossils of land reptiles on two different continents. This was important because

• Land reptiles are often found all over the world, showing that they can survive in most climates

• Land reptiles cannot swim, so the continents must have been connected for them to get across

• Land reptiles are never moved around the Earth by humans, so they must have travels to these continents by themselves

• Land reptiles fossilized much better than other animal species

Multiple Choice

Which of the following objects best represents the movement that occurs during sea-floor spreading?

• Elevator
• Conveyor belt
• Rollercoaster
• Hot air balloon

Multiple Choice

Rock at the mid ocean ridges...

• is the oldest rock on the earth.

• is older than continental rock.

• is younger than continental rock.

Multiple Choice

Where would the oldest rock be found?

• L
• M
• N
• O

Multiple Choice

____________ is where the ocean floor sinks beneath a deep ocean trench and back into the mantle

• convergence

• subduction

• divergence

• spreading