Sea Floor Spreading

1. What is the main material that the seafloor is made of?

• Water

• Sand

• Rocks

• Ice

2. What scientific tool did scientists use in the 1950s to map the ocean floor?

• Radar

• Sonar

• Telescope

• Microscope

3. What is the name of the underwater mountain range discovered in the Atlantic Ocean?

• The Andes

• The Himalayas

• The Mid-Atlantic Ridge

• The Rocky Mountains

4. What hypothesis did Henry H. Hess propose?

• Continental Drift

• Sea Floor Spreading

• Ocean Currents

• Climate Change

5. What type of plate boundary exists at the Mid-Atlantic Ridge?

• Convergent

• Divergent

• Transform

• Static

6. What happens to the oceanic plate when it collides with a continental plate?

• It rises

• It breaks apart

• It sinks

• It floats

7. What geological feature is formed when the oceanic plate is pushed beneath the continental plate?

• Mountains

• Valleys

• Trenches

• Hills

8. What cycle do seafloor spreading and subduction create?

• Weather Cycle

• Rock Cycle

• Oceanic Cycle

• Tectonic Cycle

9. What can happen when tectonic plates move underwater?

• Earthquakes

• Tsunamis

• Volcanic Eruptions

• All of These

10. What does seafloor spreading create along the ocean ridges?

• Deserts

• New Oceanic Crust

• Icebergs

• Coral Reefs