Seafloor Spreading and Tectonic Activity

The video tutorial covers the continental drift theory and its initial rejection due to lack of explanation for the movement of continents. It introduces seafloor spreading, discovered by Harry Hess, as a process where new oceanic crust forms at mid-ocean ridges and old crust is subducted. Evidence for seafloor spreading includes the age and thickness of oceanic crust and geomagnetic reversals. The tutorial explains how seafloor spreading supports the continental drift theory by showing that the ocean floor is a site of tectonic activity, balancing the creation and destruction of crust to maintain Earth's shape.

What was the name of the supercontinent mentioned in the Continental Drift Theory?

• Pangea

• Atlantis

• Gondwanaland

• Laurasia

Which scientist is credited with the idea of Seafloor Spreading?

• Charles Darwin

• Marie Tharp

• Harry Hess

• Alfred Wegener

What technology led to the discovery of the ocean floor's features?

• Radar

• Sonar

• Magnetometer

• Seismograph

According to the Seafloor Spreading Theory, what happens to the oceanic crust over time?

• It rises to form mountains

• It remains unchanged

• It becomes denser and thicker

• It is pushed away from the ridge and subducted

Where are the youngest rocks found according to the Seafloor Spreading Theory?

• On the continental shelves

• Near the mid-ocean ridge

• Far from the mid-ocean ridge

• In the deep ocean trenches

What is the significance of symmetrical stripes on the ocean floor?

• They indicate volcanic activity

• They show the age of the ocean floor

• They provide evidence for geomagnetic reversals

• They mark the boundaries of tectonic plates

How does seafloor spreading support the Continental Drift Theory?

• By proving that oceans are static

• By showing that continents are stationary

• By indicating that continents are shrinking

• By demonstrating tectonic activity in the ocean

What process balances the creation of new crust in seafloor spreading?

• Erosion

• Subduction

• Sedimentation

• Volcanism

What keeps the Earth's shape and diameter constant?

• The balance between seafloor spreading and subduction

• The movement of tectonic plates

• The rotation of the Earth

• The gravitational pull of the moon

What is the primary location where seafloor spreading occurs?

• Subduction zones

• Transform faults

• Convergent plate boundaries

• Divergent plate boundaries