Seafloor Spreading

What is the significance of ocean floor sediments in understanding seafloor spreading?

• They provide information about the age and history of the oceanic crust.

• They are primarily composed of organic materials.

• They indicate the presence of underwater volcanoes.

• They are used to measure ocean currents.

What geological feature is formed at divergent boundaries?

• Mid-ocean ridges.

• Mountain ranges.

• Volcanic islands.

• Deep-sea trenches.

What sediment evidence led to the discovery of seafloor spreading?

• Layers of sediments on the ocean floor are much thinner than layers of sediment on continents.

• Sediments on the ocean floor are composed mainly of volcanic ash.

• Continental sediments are older than oceanic sediments.

• Sediments on the ocean floor are thicker than those on land.

What is a mid-ocean ridge?

• An underwater mountain range formed by plate tectonics at divergent boundaries.

• A type of ocean current that circulates warm water around the globe.

• A deep-sea trench formed by converging tectonic plates.

• A volcanic island chain formed by hotspots in the ocean.

What is the process of subduction?

• The process where one tectonic plate moves under another and is forced into the mantle.

• The process of two tectonic plates colliding and forming mountains.

• The process where tectonic plates slide past each other without interaction.

• The process of tectonic plates moving apart and creating new crust.

What is the role of tectonic plates in seafloor spreading?

• Tectonic plates move apart at divergent boundaries, allowing magma to rise and create new crust.

• Tectonic plates collide at convergent boundaries, causing earthquakes and volcanic eruptions.

• Tectonic plates slide past each other at transform boundaries, leading to the formation of mountain ranges.

• Tectonic plates remain stationary, having no impact on seafloor spreading.

What is the significance of the age of oceanic crust in relation to seafloor spreading?

• The age of oceanic crust decreases with distance from mid-ocean ridges, supporting the theory of seafloor spreading.

• The age of oceanic crust remains constant regardless of distance from mid-ocean ridges, indicating no relation to seafloor spreading.

• The age of oceanic crust increases with distance from mid-ocean ridges, supporting the theory of seafloor spreading.

• The age of oceanic crust is irrelevant to the theory of seafloor spreading.

What occurs when the flow in the outer core changes, causing Earth's magnetic field to change direction?

• Magnetic reversal

• Geological uplift

• Tectonic shift

• Oceanic expansion

Seafloor spreading can be compared to which of the following?

• Conveyor belt

• Elevator shaft

• Escalator

• Roller coaster

What is the relationship between seafloor spreading and continental drift?

• Seafloor spreading creates new oceanic crust that pushes continents apart.

• Seafloor spreading has no effect on continental drift.

• Continental drift is a result of tectonic plate collisions.

• Seafloor spreading occurs only in the Arctic region.